month by month
Best time to visit Halong Bay: storm odds by month
The best time to visit Halong Bay (Vịnh Hạ Long) for a cruise is November to May, when storm stops are rare or absent from the record. July to September carry the highest odds: a two-night cruise starting in September has 5% to 11% odds that a storm stop overlaps it. Stops also came in June and October 2025. From winter into spring, fog is the weather to plan around; at the coastal stations of Quang Ninh it is most common from December to April.
Pick your month and nights below. Stops are ordered by the Quang Ninh Inland Waterway Port Authority when a storm signal is issued; the odds are a range from past storm tracks, not a forecast.
Some links on this page are affiliate links: the guide earns a commission when you book through them. The partner sets the price; the guide adds no fee.
the planner
Storm odds for your month and nights on board
Open a month to see its odds for each length of cruise, its fog, the stops of 2025 and 2026 and a plan.
January two nights: none recorded in 1991 to 2025
Odds a storm stop overlaps a day cruise starting in January: none recorded in 1991 to 2025.
Odds a storm stop overlaps a one-night cruise starting in January: none recorded in 1991 to 2025.
Odds a storm stop overlaps a two-night cruise starting in January: none recorded in 1991 to 2025.
Odds a storm stop overlaps a three-night cruise starting in January: none recorded in 1991 to 2025.
| Day cruise | none recorded in 1991 to 2025 |
|---|---|
| One night on board | none recorded in 1991 to 2025 |
| Two nights on board | none recorded in 1991 to 2025 |
| Three nights on board | none recorded in 1991 to 2025 |
- Fog
- 1.6 days a month with fog at Phu Lien (Hai Phong). The coastal fog study counts January as a fog month at Cua Ong and Co To (Quang Ninh), but not at Hon Dau, the station nearest Lan Ha Bay.
- Air and rain
- 17°C (63°F) mean at Phu Lien, rain on 5 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- No storm track on record came near enough to count. Fog is the weather to plan around in winter and spring; a stop for a storm is not.
February two nights: none recorded in 1991 to 2025
Odds a storm stop overlaps a day cruise starting in February: none recorded in 1991 to 2025.
Odds a storm stop overlaps a one-night cruise starting in February: none recorded in 1991 to 2025.
Odds a storm stop overlaps a two-night cruise starting in February: none recorded in 1991 to 2025.
Odds a storm stop overlaps a three-night cruise starting in February: none recorded in 1991 to 2025.
| Day cruise | none recorded in 1991 to 2025 |
|---|---|
| One night on board | none recorded in 1991 to 2025 |
| Two nights on board | none recorded in 1991 to 2025 |
| Three nights on board | none recorded in 1991 to 2025 |
- Fog
- 2.4 days a month with fog at Phu Lien (Hai Phong). The coastal fog study counts February as a fog month at Cua Ong and Co To (Quang Ninh) and at Hon Dau, the station nearest Lan Ha Bay.
- Air and rain
- 18°C (64°F) mean at Phu Lien, rain on 6 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- No storm track on record came near enough to count. Fog is the weather to plan around in winter and spring; a stop for a storm is not.
March two nights: none recorded in 1991 to 2025
Odds a storm stop overlaps a day cruise starting in March: none recorded in 1991 to 2025.
Odds a storm stop overlaps a one-night cruise starting in March: none recorded in 1991 to 2025.
Odds a storm stop overlaps a two-night cruise starting in March: none recorded in 1991 to 2025.
Odds a storm stop overlaps a three-night cruise starting in March: none recorded in 1991 to 2025.
| Day cruise | none recorded in 1991 to 2025 |
|---|---|
| One night on board | none recorded in 1991 to 2025 |
| Two nights on board | none recorded in 1991 to 2025 |
| Three nights on board | none recorded in 1991 to 2025 |
- Fog
- 3.7 days a month with fog at Phu Lien (Hai Phong). The coastal fog study counts March as a fog month at Cua Ong and Co To (Quang Ninh) and at Hon Dau, the station nearest Lan Ha Bay.
- Air and rain
- 20°C (68°F) mean at Phu Lien, rain on 10 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- No storm track on record came near enough to count. Fog is the weather to plan around in winter and spring; a stop for a storm is not.
April two nights: under 1%
Odds a storm stop overlaps a day cruise starting in April: under 1%.
Odds a storm stop overlaps a one-night cruise starting in April: under 1%.
Odds a storm stop overlaps a two-night cruise starting in April: under 1%.
Odds a storm stop overlaps a three-night cruise starting in April: under 1%.
| Day cruise | under 1% |
|---|---|
| One night on board | under 1% |
| Two nights on board | under 1% |
| Three nights on board | under 1% |
- Fog
- 1.2 days a month with fog at Phu Lien (Hai Phong). The coastal fog study counts April as a fog month at Cua Ong and Co To (Quang Ninh) and at Hon Dau, the station nearest Lan Ha Bay.
- Air and rain
- 24°C (75°F) mean at Phu Lien, rain on 7 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- Storms are less common, and the board ordered no stop in this month in 2025 or 2026; a spare day in Hanoi after the cruise still keeps your onward plans intact.
May two nights: none recorded in 1991 to 2025
Odds a storm stop overlaps a day cruise starting in May: none recorded in 1991 to 2025.
Odds a storm stop overlaps a one-night cruise starting in May: none recorded in 1991 to 2025.
Odds a storm stop overlaps a two-night cruise starting in May: none recorded in 1991 to 2025.
Odds a storm stop overlaps a three-night cruise starting in May: none recorded in 1991 to 2025.
| Day cruise | none recorded in 1991 to 2025 |
|---|---|
| One night on board | none recorded in 1991 to 2025 |
| Two nights on board | none recorded in 1991 to 2025 |
| Three nights on board | none recorded in 1991 to 2025 |
- Fog
- under 1 day a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 27°C (81°F) mean at Phu Lien, rain on 10 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- No storm track on record came near enough to count. Fog is the weather to plan around in winter and spring; a stop for a storm is not.
June two nights: 2% to 4%
Odds a storm stop overlaps a day cruise starting in June: 1% to 2%.
Odds a storm stop overlaps a one-night cruise starting in June: 1% to 3%.
Odds a storm stop overlaps a two-night cruise starting in June: 2% to 4%.
Odds a storm stop overlaps a three-night cruise starting in June: 2% to 5%.
| Day cruise | 1% to 2% |
|---|---|
| One night on board | 1% to 3% |
| Two nights on board | 2% to 4% |
| Three nights on board | 2% to 5% |
- Fog
- under 1 day a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 29°C (84°F) mean at Phu Lien, rain on 10 days of the month.
- Stops ordered
- Storm Wutip (No. 1): overnight stays stopped and guests back on land from 18:00 on 13 June 2025.
- Plan
- Storms are less common, but stops have come in this month: a spare day in Hanoi after the cruise keeps your onward plans intact.
July two nights: 7% to 11%
Odds a storm stop overlaps a day cruise starting in July: 4% to 6%.
Odds a storm stop overlaps a one-night cruise starting in July: 6% to 8%.
Odds a storm stop overlaps a two-night cruise starting in July: 7% to 11%.
Odds a storm stop overlaps a three-night cruise starting in July: 9% to 14%.
| Day cruise | 4% to 6% |
|---|---|
| One night on board | 6% to 8% |
| Two nights on board | 7% to 11% |
| Three nights on board | 9% to 14% |
- Fog
- 0 days a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 29°C (84°F) mean at Phu Lien, rain on 13 days of the month.
- Stops ordered
- Storm Wipha (No. 3): all departures and overnight stays stopped from 20 July 2025. Storm No. 1: all departures and overnight stays stopped from 17:00 on 3 July 2026.
- Plan
- Stops came in this month in recent seasons, as listed above, so plan for one: keep a spare day in Hanoi after the cruise, and read the cancellation terms before you pay.
August two nights: 5% to 10%
Odds a storm stop overlaps a day cruise starting in August: 3% to 5%.
Odds a storm stop overlaps a one-night cruise starting in August: 4% to 8%.
Odds a storm stop overlaps a two-night cruise starting in August: 5% to 10%.
Odds a storm stop overlaps a three-night cruise starting in August: 7% to 13%.
| Day cruise | 3% to 5% |
|---|---|
| One night on board | 4% to 8% |
| Two nights on board | 5% to 10% |
| Three nights on board | 7% to 13% |
- Fog
- under 1 day a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 28°C (82°F) mean at Phu Lien, rain on 14 days of the month.
- Stops ordered
- Tropical depression: all departures and overnight stays stopped from 13:00 on 18 August 2025. Tropical depression: all departures and overnight stays stopped from 7:00 on 22 August 2026.
- Plan
- Stops came in this month in recent seasons, as listed above, so plan for one: keep a spare day in Hanoi after the cruise, and read the cancellation terms before you pay.
September two nights: 5% to 11%
Odds a storm stop overlaps a day cruise starting in September: 3% to 6%.
Odds a storm stop overlaps a one-night cruise starting in September: 4% to 8%.
Odds a storm stop overlaps a two-night cruise starting in September: 5% to 11%.
Odds a storm stop overlaps a three-night cruise starting in September: 6% to 14%.
| Day cruise | 3% to 6% |
|---|---|
| One night on board | 4% to 8% |
| Two nights on board | 5% to 11% |
| Three nights on board | 6% to 14% |
- Fog
- under 1 day a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 27°C (81°F) mean at Phu Lien, rain on 12 days of the month.
- Stops ordered
- Storm Bualoi (No. 10): all departures and overnight stays stopped from 18:00 on 27 September 2025. Typhoon Yagi made landfall in the Quang Ninh to Hai Phong area on 7 September 2024.
- Plan
- Stops came in this month in recent seasons, as listed above, so plan for one: keep a spare day in Hanoi after the cruise, and read the cancellation terms before you pay.
October two nights: 2% to 7%
Odds a storm stop overlaps a day cruise starting in October: 1% to 3%.
Odds a storm stop overlaps a one-night cruise starting in October: 2% to 5%.
Odds a storm stop overlaps a two-night cruise starting in October: 2% to 7%.
Odds a storm stop overlaps a three-night cruise starting in October: 3% to 8%.
| Day cruise | 1% to 3% |
|---|---|
| One night on board | 2% to 5% |
| Two nights on board | 2% to 7% |
| Three nights on board | 3% to 8% |
- Fog
- under 1 day a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 25°C (77°F) mean at Phu Lien, rain on 6 days of the month.
- Stops ordered
- Storm Matmo (No. 11): all departures and overnight stays stopped from 8:00 on 5 October 2025.
- Plan
- Storms are less common, but stops have come in this month: a spare day in Hanoi after the cruise keeps your onward plans intact.
November two nights: 1% to 2%
Odds a storm stop overlaps a day cruise starting in November: 0.4% to 0.9%.
Odds a storm stop overlaps a one-night cruise starting in November: 0.6% to 1.4%.
Odds a storm stop overlaps a two-night cruise starting in November: 1% to 2%.
Odds a storm stop overlaps a three-night cruise starting in November: 1% to 2%.
| Day cruise | 0.4% to 0.9% |
|---|---|
| One night on board | 0.6% to 1.4% |
| Two nights on board | 1% to 2% |
| Three nights on board | 1% to 2% |
- Fog
- 0.5 days a month with fog at Phu Lien (Hai Phong). Not a fog month in the coastal fog study.
- Air and rain
- 22°C (72°F) mean at Phu Lien, rain on 4 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- Storms are less common, and the board ordered no stop in this month in 2025 or 2026; a spare day in Hanoi after the cruise still keeps your onward plans intact.
December two nights: none recorded in 1991 to 2025
Odds a storm stop overlaps a day cruise starting in December: none recorded in 1991 to 2025.
Odds a storm stop overlaps a one-night cruise starting in December: none recorded in 1991 to 2025.
Odds a storm stop overlaps a two-night cruise starting in December: none recorded in 1991 to 2025.
Odds a storm stop overlaps a three-night cruise starting in December: none recorded in 1991 to 2025.
| Day cruise | none recorded in 1991 to 2025 |
|---|---|
| One night on board | none recorded in 1991 to 2025 |
| Two nights on board | none recorded in 1991 to 2025 |
| Three nights on board | none recorded in 1991 to 2025 |
- Fog
- 0.9 days a month with fog at Phu Lien (Hai Phong). The coastal fog study counts December as a fog month at Cua Ong and Co To (Quang Ninh), but not at Hon Dau, the station nearest Lan Ha Bay.
- Air and rain
- 18°C (64°F) mean at Phu Lien, rain on 4 days of the month.
- Stops ordered
- No board stop notice in this month in 2025 or 2026.
- Plan
- No storm track on record came near enough to count. Fog is the weather to plan around in winter and spring; a stop for a storm is not.
The low end of each range counts storms and tropical depressions whose track came within 150 km of the middle of Halong Bay in that month, the high end those within 350 km, over the seasons 1991 to 2025. A stop is counted as 2 days on top of your nights on board, about the length of the Matmo stop of October 2025 from the board notice to the final national bulletin. A range, not a forecast.
one night on board
The year in soundings
Each sounding is one month: the pale column is the high end of the range, the dark core the low end, both for a one-night cruise. The deeper the sounding, the better the odds that a storm stop overlaps the cruise.
- Jannone recorded in 1991 to 2025
- Febnone recorded in 1991 to 2025
- Marnone recorded in 1991 to 2025
- Aprunder 1%
- Maynone recorded in 1991 to 2025
- Jun1% to 3%
- Jul6% to 8%
- Aug4% to 8%
- Sep4% to 8%
- Oct2% to 5%
- Nov0.6% to 1.4%
- Decnone recorded in 1991 to 2025
Odds for a one-night cruise starting in each month, from storm tracks of the seasons 1991 to 2025. A month with no track near enough to count reads "none recorded". For two nights on board, the planner above has every month, and the 2 night cruise guide sets one night against two.
travel advice
Storm season, as three governments state it
The UK, Australian and US travel advisories give three different storm seasons for Vietnam. Each is printed here as its body states it.
- UK, Foreign, Commonwealth & Development Office: the tropical storm season normally runs May to November, and travelers should be prepared to change plans at short notice.
- Australia, Smartraveller: the storm season is usually June to November.
- United States, Department of State: storms hit the central and northern coasts from June to December, with the worst storms typically in September to November.
For the coast closest to the bay the numbers are narrower. On the Quang Ninh to Thanh Hoa coast, which includes Halong Bay, July, August and September brought 76% of the storms and tropical depressions of 1961 to 2014, and this stretch has Vietnam's highest storm frequency, 2.0 to 2.5 storms and tropical depressions per year, according to Vietnam's Institute of Meteorology, Hydrology and Climate Change.
Across the whole Vietnamese coast the peak comes later: September and October hold the most storms, with 271 storms of 327 falling in July to November in 1951 to 2013. The advisories cover the whole country, which is why their seasons run later than the odds for the bay itself.
sea fog
Fog in winter and spring, station by station
No weather station stands on the bay itself, so fog is read at the nearest coastal stations, each with its own season. On a foggy morning the nearer islands may show while the farther ones fade from view.
A study by the Northeast Regional Hydro-Meteorological Station, using observations from 2014 to 2019, found sea fog at Cua Ong and Co To, on the Quang Ninh coast north-east of Halong Bay, mainly from December to April. At Hon Dau on the Hai Phong coast, the station nearest to Lan Ha Bay, fog comes mainly from February to April.
At Phu Lien, the coastal station in Hai Phong, west of the bay, with a long record, fog days peak in March at 3.7 days a month, against 1.6 days in January and 0 days in July (1996 to 2024).
Rain, heat and the sea month by month are on Halong Bay weather.
on the day
Who stops the boats, and how a stop ends
On Halong Bay and Bai Tu Long Bay, storm stops are ordered by the Quang Ninh Inland Waterway Port Authority. The decision to grant a port departure permit rests with the Inland Waterway Port Authority (Cảng vụ), under Quang Ninh Decision 43/2024.
The rule names no wind speed or visibility limit. Its trigger is weather not safe to continue the journey: the captain tells passengers and moves the boat to shelter, and the port authority says where. Stop notices run from a stated hour until the final bulletin on the storm, the bulletin Vietnam's weather service calls tin cuối cùng về bão.
Before that, the national service issues an emergency storm bulletin when a storm may reach the mainland within 48 hours, and then main bulletins every three hours, 8 bulletins per day. A storm of wind level 8 to 9 at sea is disaster risk level 3.
On the Cat Ba bays, including Lan Ha Bay, Hai Phong's Decision 253/2025 keeps tourist boats in port when the weather is unsafe or there is a dangerous weather warning. Hai Phong's notices are not gathered in a public log the way Quang Ninh's are.
Stops of 2025 on Halong Bay began on 13 June 2025 (Wutip), 20 July 2025 (Wipha), 18 August 2025 (a tropical depression), 27 September 2025 (Bualoi) and 5 October 2025 (Matmo). Typhoon Yagi made landfall in the Quang Ninh to Hai Phong area on 7 September 2024. Every notice with its start and end is on the cruise suspension log.
your dates
Booking a cruise for a storm month
From June to October, plan as if a stop could happen and treat it as a bonus when it does not.
- Put the cruise early in your trip and keep a spare day in Hanoi after it, so a stop moves the cruise rather than your flight.
- One night on board is a shorter window than two; Halong Bay overnight cruises lists the one-night boats.
- Read the cancellation line before you pay. Terms differ between listings: Hanoi: 2-Day 1-Night Halong, Lan Ha Bay Cruise with Balcony states Free cancellation up to 24 hours before start for a full refund (as listed); All inclusive Bhaya Classic cruise 2-Day 1-Night Halong Bay Tour states Free cancellation up to 6 days before the experience for a full refund (as listed).
What a stop means for your booking, and how rebooking works, is on storm cancellations. To compare every cruise by bay, nights and price, start at the Halong Bay cruise chooser.
before you go
Best time to go to Halong Bay: questions
What is the best month to visit Halong Bay?
November to May, when storm stops are rare or absent from the record: no storm track near enough to count was recorded in January, February, March, May or December over 1991 to 2025. March has the most fog days at Phu Lien, so within that stretch April, May and November pair low storm odds with less fog.
When should you not visit Halong Bay?
July to September carry the highest storm-stop odds: for a two-night cruise starting in August they are 5% to 10%. A cruise can still run in those months, but keep a spare day after it and choose a booking whose cancellation terms you can live with.
Is it cold on a Halong Bay cruise in winter?
Cool rather than cold. At Phu Lien, the nearest long-record station, January averages 17°C (63°F) and February 18°C (64°F). On deck in the wind it feels cooler, so bring a warm layer for the evening and the morning.
Can a storm cancel my cruise on the day?
Yes. When a storm signal is issued, departure permits stop, ordered by the Quang Ninh Inland Waterway Port Authority on Halong Bay. What you get back depends on the operator's and the booking site's terms. The odds by month and nights are in the planner at the top of this page.
Sources
- Under Quang Ninh Decision 43/2024/QĐ-UBND, when weather becomes unsafe the captain must tell passengers and move the boat to shelter, and the decision to grant a port departure permit rests with the Inland Waterway Port Authority (Cảng vụ). Quang Ninh Provincial People's Committee, Decision 43/2024/QĐ-UBND of 8 Oct 2024 (in force 20 Oct 2024), Regulation on managing inland waterway vessels serving tourists on Halong Bay and Bai Tu Long Bay, 8 October 2024.
- Smartraveller states the storm season in Vietnam is usually June to November months. Australian Government DFAT, Smartraveller, Vietnam travel advice (updated 24 Sep 2026, still current 14 Nov 2026), 24 September 2026.
- The US Department of State states storms hit Vietnam's central and northern coasts from June to December, with the worst storms typically in September to November months. US Department of State, Vietnam travel advisory and country information (page last updated 2 Jul 2026; advisory issued 24 Jun 2026), 2 July 2026.
- Under Hai Phong Decision 253/2025/QĐ-UBND, tourist boats on the Cat Ba bays may not leave port when unsafe or when there is a dangerous weather warning. Hai Phong City People's Committee, Decision 253/2025/QĐ-UBND (31 Dec 2025), Regulation on tourism and tourist boats on the Cat Ba bays, full text as reproduced by thuvienphapluat.vn, 31 December 2025.
- The UK FCDO states the tropical storm season in Vietnam normally runs May to November months. UK Foreign, Commonwealth & Development Office, Foreign travel advice: Vietnam, 21 September 2026.
- The UK FCDO advises travelers in the storm season to be prepared to change travel plans at short notice. UK Foreign, Commonwealth & Development Office, Foreign travel advice: Vietnam, 21 September 2026.
- A 2022 study by the Northeast Regional Hydro-Meteorological Station, using 2014-2019 observations, found that sea fog at Cua Ong and Co To (Quang Ninh) occurs mainly in the months December to April. Lanh Nguyen Viet and Doan Phan Van, 'Nghiên cứu dự báo sương mù vùng biển Quảng Ninh - Hải Phòng', Tạp chí Khoa học Tài nguyên và Môi trường no. 41, 2022, 14 July 2022.
- The same 2022 study found fog at Hon Dau station (Hai Phong coast, nearest station to Lan Ha Bay in the study) occurs mainly in February to April months. Lanh Nguyen Viet and Doan Phan Van, 'Nghiên cứu dự báo sương mù vùng biển Quảng Ninh - Hải Phòng', Tạp chí Khoa học Tài nguyên và Môi trường no. 41, 2022, 14 July 2022.
- Quang Ninh Decision 43/2024/QD-UBND sets no numeric wind or visibility threshold; when weather is unsafe the captain moves the boat to shelter and the port authority tells boats where to shelter, so the stated trigger is weather not safe to continue the journey. Quang Ninh Provincial People's Committee, Decision 43/2024/QD-UBND, Article 7(5) and 7(6), 8 October 2024.
- For the Quang Ninh to Thanh Hoa coast (which includes Halong Bay), July, August and September together account for this share of storms and tropical depressions affecting the coast in 1961-2014, according to Vietnam's Institute of Meteorology, Hydrology and Climate Change 76%. Nguyen Van Thang et al., 'Ảnh hưởng của bão ở Việt Nam thời kỳ 1961-2014', VNU Journal of Science: Earth and Environmental Sciences 32(3S), 2016, 210-216.
- The Quang Ninh to Thanh Hoa coast has Vietnam's highest storm frequency, with an average per year (1961-2014) of 2.0 to 2.5 storms and tropical depressions per year. Nguyen Van Thang et al., 'Ảnh hưởng của bão ở Việt Nam thời kỳ 1961-2014', VNU Journal of Science: Earth and Environmental Sciences 32(3S), 2016.
- Across all of Vietnam's coast, storms entering the coastal zone in 1951-2013 were spread by month with the most in October and September and few from December to May; the count for July to November combined is 271 storms of 327. Du Van Toan et al., 'Một số đánh giá thống kê về tính chất của bão Biển Đông và vùng bờ biển Việt Nam giai đoạn 1951-2013', Tạp chí Khoa học và Công nghệ Biển 14(2), 2014, Table 4.
- Storm suspensions on Halong Bay stop departure permits; they are issued by the Quang Ninh inland waterway port authority (Cảng vụ Đường thủy và Đăng kiểm phương tiện thủy nội địa, under the provincial Department of Construction) on the direction of the provincial disaster steering committee, or come as a notice of the provincial Department of Agriculture and Environment to that authority (Matmo 2025, Storm No.1 2026); the body that stops the permits is Quang Ninh Inland Waterway Port Authority. Ha Long Bay Management Board website, suspension notices 2025-2026 (posts 240, 268, 287, 292, 990, 1215), 3 July 2026.
- Quang Ninh storm suspension notices name no wind threshold; they run from a stated hour until the final official bulletin on the storm or tropical depression, in the wording until the final bulletin on the storm. Quang Ninh Inland Waterway Port Authority, document 266/CVĐTNĐ-ATQLKCHT of 21/8/2026, as posted by the Ha Long Bay Management Board, 21 August 2026.
- For Storm Wutip the Quang Ninh port authority suspended overnight cruise permits on Halong Bay and ordered all tourist boats to return passengers to the mainland before 18:00 on 13 June 2025. Quang Ninh Inland Waterway Port Authority, dispatch 618/CVĐTNĐ-ATQLKCHT of 13/6/2025, as posted by the Ha Long Bay Management Board, 13 June 2025.
- For Storm Wipha (Storm No.3 of 2025) the Quang Ninh port authority stopped granting departure permits to passenger boats (boats returning to the mainland to land passengers still allowed) from 20 July 2025. Quang Ninh Inland Waterways Port Authority notice, as posted by the Ha Long Bay Management Board (posted 2025-07-20 10:26), 20 July 2025.
- For a tropical depression the Quang Ninh port authority suspended departure permits for tourist and overnight boats from 13:00 and required all passengers landed by 15:00 on 18 August 2025. Quang Ninh Inland Waterway Authority (Department of Construction) notice, as posted by the Ha Long Bay Management Board, 18 August 2025.
- For Storm Bualoi (Storm No.10 of 2025) the Quang Ninh port authority suspended departure, marine tourism and overnight permits from 18:00 on 27 September 2025. Quang Ninh Inland Waterway Port Authority notice, as posted by the Ha Long Bay Management Board, 27 September 2025.
- For Typhoon Matmo (Storm No.11 of 2025) all tourism and overnight permits on Halong Bay were suspended from 8:00 on 5 October 2025. Quang Ninh Department of Agriculture and Environment notice to the Inland Waterway Port Authority, as posted by the Ha Long Bay Management Board, 5 October 2025.
- Under Prime Minister Decision 18/2021/QD-TTg, Vietnam's national hydro-meteorological service issues an emergency storm bulletin (tin bão khẩn cấp) when a storm may directly affect mainland Vietnam within 48 hours. Prime Minister of Vietnam, Decision 18/2021/QD-TTg of 22/4/2021, Article 9.3, 22 April 2021.
- Under Decision 18/2021/QD-TTg, during an emergency storm bulletin the national hydro-met service issues main bulletins every three hours, a count per day of 8 bulletins per day. Prime Minister of Vietnam, Decision 18/2021/QD-TTg, Article 13.2, 22 April 2021.
- Under Decision 18/2021/QD-TTg the final storm bulletin (tin cuối cùng), which ends Quang Ninh's boat suspensions, is issued when the storm weakens to a low, leaves Vietnam's direct-impact zone or leaves the East Sea; the bulletin type is tin cuối cùng về bão. Prime Minister of Vietnam, Decision 18/2021/QD-TTg, Article 9.6, 22 April 2021.
- Under Decision 18/2021/QD-TTg a storm of wind level 8 to 9 at sea or in coastal waters is disaster risk level 3 risk level. Prime Minister of Vietnam, Decision 18/2021/QD-TTg, Article 42.1, 22 April 2021.
- Typhoon Yagi (Storm No.3 of 2024) made landfall in the Quang Ninh to Hai Phong area around noon, as recorded by the Vietnam disaster management center, on 7 September 2024. Disaster Management Policy and Technology Center (VDDMA), disaster record 'Storm No. 3 - YAGI'.
- Storm odds and weather by month. Storm tracks: NOAA NCEI IBTrACS v04r01, seasons 1991 to 2025, systems within 150 km to 350 km of Halong Bay; a stop counted as 2 days from the board notice to the final national bulletin. Weather: NOAA Global Summary of the Day, Phu Lien (Hai Phong) and Bach Long Vi, 1996 to 2024; sea surface temperature: NOAA OISST v2.1, the grid cell south of Cat Ba Island, 1991 to 2020. Stop log: Ha Long Bay Management Board notices and the national final storm bulletins (data/suspensions.json).
- Partner listing details. Each partner listing page as read on its read date (pier, cancellation terms, rating)
- How the storm odds are counted. NOAA NCEI IBTrACS v04r01, seasons 1991 to 2025: systems whose track came within 150 km or 350 km of the middle of Halong Bay; a stop counted as 2 days from the board notice to the final national bulletin (Matmo 2025).
Photographs
- Halong Bay in mist or fog. Photo: mmmmngai@rogers.com / Wikimedia Commons, CC BY-SA 2.0
- Wide Halong Bay seascape with karst islands. Photo: Helenakfronczak / Wikimedia Commons, CC BY-SA 4.0
- Sunset over the bay. Photo: Mustang Joe / Wikimedia Commons, CC0