Booking choice: The 2-day Ha Long and Lan Ha cruise, from $126 per person. Check dates Tour details
There is no single best month for Ha Long Bay, because the bay has two moods. From November to March it's cool and often hazy, the karsts fading into soft grey layers while you hold a cup of tea on deck. From May to September it's hot, green and wet, and the swim off the beach at Ti Top island becomes the best part of the day.
This guide sticks to named sources: the Quang Ninh provincial government's climate page, the Ha Long Bay Management Board's sailing hours, Wikipedia's climate articles, VnExpress International for storm news, and the cruise listings themselves for the surcharges.
The quick answer
There is no official best month. The Quang Ninh provincial portal says more than 85% of the province's rain falls in summer, especially in July and August, and that storms come mainly in June, July and August. That makes October to April the drier half for sightseeing and May to September the warm swimming season. Boats sail all year, from 5am to 8pm in summer and from 5.30am to 7pm in winter, per the Ha Long Bay Management Board, and the 2-day Ha Long and Lan Ha cruise runs in every season.
What is the best month to visit Ha Long Bay?
No official source names one. On Quang Ninh province's figures, October to April is the drier half of the year and May to September the hot, wet half with the storms. We'd pick November or December for dry days on deck, or April and May for warmer water before the storm months.
What the sources say, in short:
- Rain is a summer thing. The Quang Ninh provincial portal puts annual rainfall at 1,700 to 2,400 mm and says more than 85% of it falls in summer, especially in July and August. Winter brings only 150 to 400 mm.
- Storms come in midsummer. The same page says storms affect the province mainly in June, July and August, and are strongest on the islands and the coast.
- Winter is mild. Wikipedia's Climate of Vietnam article gives the north-east coast a coldest-month mean of about 16°C and a hottest-month mean of about 28°C.
- The cruise lines read it the same way. Two listings on this site charge a peak-season supplement from 1 October to 30 April.
Our take: if the views matter more than the swim, go between October and April and enjoy the haze. If you want to jump off the boat into warm water, go between May and September and keep your plans flexible.
What is Ha Long Bay like in winter?
Cool, fairly dry and often misty. Wikipedia describes winters in north-east Vietnam as cold and cloudy with drizzle, and the Quang Ninh provincial portal notes that winter on the offshore islands often comes with thick mists.
Winter on the bay runs roughly from November to March. What to expect:
- Soft light. Mist sits between the islands, and photos come out in layers of grey and green rather than postcard blue. We like it: the karsts look like an ink painting.
- Cold fronts. Wikipedia counts 3 to 4 cold fronts a month reaching northern Vietnam in winter. On a moving boat the wind adds to it, so bring a warm layer for the top deck.
- Drizzle, not downpours. Winter is the drier season, but drizzle is common in the north, per the same article. A light rain jacket earns its space.
- Shorter sailing days. From 1 November to 31 March boats may leave port from 5.30am and must be back by 7pm, per the Ha Long Bay Management Board.
Swimming stays on the program, but it's your call; the kayak and the bamboo boat don't need warm water. Our winter 2026 post covers this season, and the packing guide has the layers.
A balcony cabin suits a misty morning: tai chi on deck at sunrise, then breakfast with the view.
Check dates for the 2-day Ha Long and Lan Ha cruiseWhat is the weather like in Ha Long Bay in summer?
Hot, humid and wet, with the warmest days of the year. Wikipedia puts the north-east's rainy season at May to September, and Quang Ninh province says July and August are the wettest months.
Summer is when the bay looks most like the posters: bright sun on jade water, green forest on every island and long evenings on deck. Practical points:
- Heat. The hottest-month mean on the north-east coast is about 28°C, per Wikipedia. Shade, a hat and water matter more than any jacket.
- Rain and thunder. Most of the province's rain falls in these months, and Wikipedia notes that thunderstorms are most common in the rainy season.
- Swimming season. Day cruises stop at the beach on Ti Top island, and the Lan Ha cruises swim off the boat or at Ao Ech. In June 2026 the Ha Long Bay Management Board inspected lifesaving equipment and lifeguard services at Ti Top beach ahead of the peak summer season.
- Longer days on the water. From 1 April to 31 October boats may leave from 5am and must be back by 8pm. Sung Sot Cave, Luon Cave and Ti Top receive visitors from 7.30am to 5.30pm from 16 April to 31 October, per the Management Board.
For a summer day, the Lan Ha day cruise is the swimmer's pick: a kayak and a swim at Ao Ech, then the jacuzzi.
Lan Ha Bay in a day: a bamboo boat through Dark and Bright Cave, then kayaking and a swim at Ao Ech.
Explore the Lan Ha day cruise Tour detailsWhat months should you avoid in Ha Long Bay?
None, if you plan for them: the bay never closes for a season. The months to plan around are June to October, with most storms from June to August per Quang Ninh province, and short-notice cancellations of overnight cruises from August to October, per VnExpress International.
Every month has cruises on the water. Treat summer and early autumn as the flexible season:
- June, July and August are the storm months on the Quang Ninh provincial portal, and July and August the wettest.
- August to October is when overnight cruise tours in Ha Long and Lan Ha Bay are often cancelled suddenly, VnExpress International wrote in July 2024.
- Christmas, New Year and Lunar New Year carry surcharges on several listings (see below), so they cost a little more rather than being worse.
The plan is simple. Book with free cancellation (every tour here cancels free up to 24 hours before), keep a spare day in Hanoi after a summer cruise, and check the forecast two or three days out. If a storm closes the bay, you move the date or cancel.
Sailing in the storm months? This 2-day cruise cancels free up to 24 hours before, with a pool and spa on board.
Check dates for the Elite cruise with poolDo Ha Long Bay cruises get cancelled for bad weather?
Sometimes. When a storm approaches, the authorities stop issuing sailing permits and the boats stay in port. The listings say itineraries can change with the weather, and one promises a full refund if a major climatic event cancels the cruise.
Two recent examples show how it works:
- July 2024, storm Prapiroon. VnExpress International reported that Quang Ninh and Hai Phong stopped issuing permits for tourist boats to sail out and stay overnight from midday on 22 July, and cruise operators brought guests back to shore.
- 13 June 2025, storm Wutip. The Ha Long Bay Management Board posted a notice suspending overnight permits for that day and asking every tourist boat to bring passengers back to the mainland before 6pm.
What the listings say: schedules on the 2-day Ha Long and Lan Ha cruise are "subject to change without notice, depending on the weather and operating conditions", and the Lan Ha day cruise offers a full refund if a major climatic event cancels the cruise. Weather and tide levels can also change the order of the stops, per the same listings.
What time do Ha Long Bay boats sail in each season?
Boats may leave port from 5am and must be back by 8pm in summer (1 April to 31 October), and from 5.30am to 7pm in winter (1 November to 31 March), per the Ha Long Bay Management Board.
The caves and Ti Top island keep their own hours, on slightly different season dates. The Management Board's table, updated on 6 November 2024:
| Place | Summer (16 April to 31 October) | Winter (1 November to 15 April) |
|---|---|---|
| Sung Sot Cave | 7.30am to 5.30pm | 7.30am to 5pm |
| Luon Cave | 7.30am to 5.30pm | 7.30am to 5pm |
| Ti Top island | 7.30am to 5.30pm | 7.30am to 5pm |
| Thien Canh Son Cave (Bai Tu Long) | 7.30am to 5pm | 8am to 4.45pm |
The day cruise timetables fit inside both: the day cruise lists Sung Sot Cave at 1.30pm, Luon Cave at 2.45pm and Ti Top at 3.45pm, then the sunset party on the way back.
The classic day route runs all year: Sung Sot Cave, Luon Cave by kayak and the Ti Top climb, back by evening.
Check dates for the Ha Long Bay day cruiseAre there holiday surcharges on Ha Long Bay cruises?
Yes, on some dates. Several listings add a surcharge for Christmas, New Year and national holidays, and two add a peak-season charge from 1 October to 30 April.
From the listings on this site:
- The Elite cruise: a holiday surcharge on 24 December, 31 December and over Lunar New Year, 5 to 8 February 2027. Its taxes and peak-season surcharges are in the price for bookings made from 1 July 2026.
- The 6-star cruise: a Tet surcharge of $5 per person.
- The Bai Tu Long Bay cruise: a peak-season charge of US$10 per person (US$15 on the 6-star option) from 1 October to 30 April, payable on the day, plus a surcharge on Christmas, New Year and national holidays.
- The 3-day Bai Tu Long cruise: $20 per person in peak season from 1 October to 30 April, plus a holiday surcharge.
- The 2-day Ha Long and Lan Ha cruise and the Ninh Binh tour: a surcharge on Christmas, New Year and national holidays.
- The day cruise: a New Year surcharge.
Looking for the cheapest months? Going by those listings, May to September avoids the peak-season charges. For Christmas and Tet, book early; free cancellation up to 24 hours before keeps it low-risk. Our holiday post has the 2026 to 2027 dates, and the prices guide covers what each fare includes.
A panoramic pool, spa and balcony cabin, with taxes and peak-season surcharges included for bookings from 1 July 2026.
Explore the Elite cruise with pool Tour detailsWhich Ha Long Bay cruise suits each season?
Every cruise runs in every season. In winter a balcony cabin earns its price, in summer pick a boat with swim stops, and in the storm months book with free cancellation.
The seasons side by side, from the sources above. Leonie, on the Bai Tu Long Bay cruise (November 2026): "We had a wonderful cruise through the tranquil Bai Tu Long Bay. The cabins were very spacious and nice, the group size was comfortable at just about 20 people, and the food was very tasty."
| Season | Months | Weather | Boats sail | A good fit |
|---|---|---|---|---|
| Winter | November to March | Cool and drier, drizzle, mist on the islands | 5.30am to 7pm | 2-day balcony cruise |
| Spring | April to May | Warming up; the rainy season begins | 5am to 8pm | Luxury day cruise |
| Summer | June to August | Hottest and wettest; the storm months | 5am to 8pm | Lan Ha day cruise |
| Autumn | September to October | The rainy season ends; short-notice cancellations possible | 5am to 8pm | Bai Tu Long cruise |
From-prices on the tour pages are GetYourGuide prices in USD and move with the date. Still choosing a boat? Our cruise comparison weighs the routes, and the day or overnight guide helps with the length.
Frequently asked questions
Is Ha Long Bay cold in December?
Mild rather than cold. Wikipedia gives the north-east coast a coldest-month mean of about 16°C, and the wind on deck makes it feel cooler, so bring a warm layer. Boats sail from 5.30am to 7pm in winter.
Is October a good time to visit Ha Long Bay?
Often, yes: the rainy season in north-east Vietnam ends in September or October, per Wikipedia. VnExpress International has noted that overnight cruises can be cancelled at short notice from August to October, so book with free cancellation.
Can you swim in Ha Long Bay in winter?
You can, since the swim stops stay on the program all year, but the warm swimming months are May to September. All activities are optional, as the 6-star cruise listing puts it.
When are the Lunar New Year surcharges in 2027?
The Elite cruise lists a holiday surcharge from 5 to 8 February 2027, and the 6-star cruise a Tet surcharge of $5 per person. Several other cruises add a surcharge for national holidays.
Ready to book
Choose your cruise
Free cancellation up to 24 hours before on every option. Prices are from-prices in USD and move with the season.
Ha Long and Lan Ha Bay 2-Day Cruise with Balcony
- 2 days, 1 night in a balcony cabin
- All meals on board
- Kayaking, cooking class, tai chi
Elite Ha Long and Lan Ha 2-Day Cruise with Pool
A night on the bay with a panoramic pool, spa and balcony cabin
Ha Long and Bai Tu Long Bay 2-Day Cruise
The quieter north-east route, with fewer boats around you
