Best Time to Visit Halong Bay: Weather, Seasons & Tips 2025

Halong Bay Weather at A Glance

Situated in the North of Vietnam, Halong Bay is blessed with a monsoon tropical climate featuring four seasons: spring (Feb - Apr), summer (May - Aug), autumn (Sep - Oct), and winter (Nov - Jan). Spring brings warm and pleasant days, summer is hot and humid, autumn offers cool and comfortable weather, while winter tends to be chilly and misty.

The annual weather and temperature in Halong are influenced by its coastal location. While northern inland areas can experience harsher summer heat and colder winters, the bay enjoys milder conditions thanks to the sea. 

Average air temperatures range from 15°C (59°F) in the winter to 30°C (86°F) in the summer, with extremes from 10°C to 38°C (50 - 100°F). Sea temperatures stay fairly comfortable, usually between 20°C and 30°C (68 - 86°F), ideal for swimming, especially from late spring to early autumn. 

The bay is also known for its high humidity year-round, with occasional thick fog in winter that gives the seascape a dreamy, mystical look.

When Is the Best Time to Visit Halong Bay?

The best time to visit Halong Bay is from March to April or October to November, when the weather is pleasant and the rainfall is low, perfect for sightseeing and outdoor activities.

That said, the bay’s climate shifts noticeably through the year, and each season has its own charm. The ideal time for your trip really depends on your personal travel preferences.

A rough guide to the best time you travel to Halong Bay 

No matter when you visit, Halong Bay reveals a different side of its beauty, which is best experienced on a cruise that lets you truly immerse yourself in the magic of the bay.

Seasonal Guide to Weather and Trip Planning

Here’s a seasonal snapshot, each bringing its own weather and climate patterns.

Spring (February - April)

Spring in Halong Bay is characterized by warm weather with moderate temperatures and high humidity. During this time, the average temperature ranges from 18 to 26°C (64 - 78°F). Humidity remains relatively high, at around 65-75%, and rainfall is moderate, with 7-10 rainy days per month. The rain is usually short and light rather than heavy downpours.

Early spring can still feel chilly, with drizzle and high humidity creating misty mornings over the limestone peaks, perfect for photography. By March and April, the skies gradually clear, the sun grows warmer, and conditions become more stable, making the landscape feel fresh and vibrant. 

Visit Halong Bay in Spring

Overall, spring is highly recommended for travelers seeking a balance of mild weather and a mix of mystical and vibrant scenery, making it an ideal time for cruise tours and outdoor activities.

Travel Planning

• Things to do: Kayaking, bamboo boating, cycling, trekking, relaxing cruises

Spring is one of the most pleasant times for cruising Halong Bay, making it perfect for longer itineraries. A 3D2N journey is highly recommended in this season with visits to famous stops, including Sung Sot Cave, Titop Island, etc. The extra day allows you to venture further, combining kayaking through hidden lagoons like Trinh Nu Cave and Pearl Farm. 

This is ideal for couples who want to enjoy romantic landscapes and families with children who prefer smoother cruising conditions.

Note: Price per person for 2d1n cruise 

Know Before You Go

• Pack a sweater or a light jacket, as early spring can be a bit chilly.
• Bring non-slip sneakers and waterproof essentials to stay dry during the drizzle season.
• Keep some cold medicine handy for damp, chilly, and changeable weather in late spring.
• Book at least 3 months in advance for better rates and options, as peak season brings higher tour and hotel prices.
• Please be aware that some services may be unavailable during the Vietnamese Lunar New Year (late January - early February)
• Avoid traveling during Hung Kings’ Commemoration and Reunification Day (late April) due to heavy domestic crowds.

Summer (May - August)

Summer is the hottest time of the year, with average temperatures ranging from 28 to 36°C (82 - 95°F) and humidity around 85%. June and July are the peak heat months, often reaching 35 - 38°C (95 - 100°F), while August sees the most rainfall, with 15 - 20 rainy days, though showers are usually short and followed by clear skies. After the rain, the bay turns lush and green, with spectacular sunsets sometimes, offering a unique experience even in the rainy season.

Mornings bring bright sunshine and warm seawater, while afternoon showers are frequent, with thunderstorms or even tropical storms possible. The air can feel heavy before it rains, making the heat more intense. Luckily, at nightfall, the temperature can drop from 3 to 4ºC, making it quite pleasant when you are on an overnight cruise.

Overall, travelers should be aware of sudden storms that may lead to cruise cancellations or itinerary changes. Despite the weather risks, summer is full of energy and offers some of the lowest cruise prices of the year, especially from late July onward.

>> Curious about the pros and cons? Check out our guide on What to Expect in Halong Bay on Summer Days.

Travel Planning

• Things to do: Water activities (swimming, kayaking, SUP, catamaran), mountain climbing

Despite being the peak domestic season, summer’s sunny days and warm seawater make it perfect for an off-the-beaten-path getaway, such as a 2D1N cruise to Bai Tu Long Bay. The trip often includes beach time and panoramic views at Cap La Island, plus kayaking through the calm lagoons of Cong Do.

Summer is ideal for families with kids seeking water activities, budget travelers looking for lower prices, and adventure seekers wanting to pack highlights into a short trip.

Note: Price per person for 2d1n cruise 

Handy Notes

• Wear light, breathable, light-colored clothes to stay cooler under the sun.
• Avoid being outdoors during the hottest hours, typically from 11:00 to 15:00.
• Plan sightseeing in the early morning or late afternoon for cooler temperatures and less chance of rain.
• Bring sunscreen and sunglasses along because of the high UV index.
• Prepare a light raincoat or an umbrella on hand to prepare for sudden rain.
• Reconsider traveling on weekends, as this is peak season for Vietnamese tourists.
• Take advantage of many cruise promotions this season, with discounts of up to 40%.
• Regularly update the weather forecast and prepare a backup plan in case of typhoons.

>> Find out more about Halong Bay Storm & What to Do If Your Halong Bay Cruise Is Cancelled.

Autumn (September - October)

Autumn is widely admired as the best time of year to visit Halong Bay. The air cools down after the intense summer heat, and rainfall decreases significantly. The weather has a pretty high humidity (~75%) with the pleasant temperature from 24 - 30°C (75 - 86°F). The sky during this time is blue and bright with sunshine and slight wind, making the weather mild all day round, sometimes a bit chilly. Every natural scene in some way becomes more beautiful, perfect for sightseeing and outdoor activities.

Autumn is the ideal time to take a Halong Cruise.

October strikes the perfect balance between warmth and comfort. Humidity drops to around 70 - 75%, and rainfall decreases to about 8 - 12 days per month. Showers are lighter and less frequent, usually passing quickly and followed by crisp, clear skies. 

If you want both enjoyable weather and smooth cruising conditions, autumn is the best time for Halong Bay. Light breezes sweep across the bay, keeping the air comfortable with less haze and fewer storms, making it the “golden season” for cruising and photography.

Travel Planning

• Activities: Overnight cruise, photography, island tour, sightseeing seaplane

Autumn is the ideal season to take in Halong Bay at its best; overnight cruises for 2 or 3 days are rewarding options. Experiencing the quieter corners, such as Lan Ha Bay, where the crowds are fewer than in Halong Bay, will be a wonderful option. A cruise with activities like kayaking in Tra Bau, exploring Dark & Bright Cave, and visiting a local fishing village can create unforgettable moments.

Couples, honeymooners who want a romantic setting, and photographers chasing the most breathtaking sunsets and clear skies will love the autumn in Halong Bay. 

Note: Price per person for 2D1N cruise 

Besides, adding a seaplane sightseeing flight over the bay for an unforgettable bird’s-eye perspective of the limestone landscape is also highly recommended.

What You Should Know

• Book 3 - 4 months in advance, particularly for higher-class cruises, as autumn is high season for international travelers
• Early September offers cheaper cruise rates compared to later months.
• Don’t forget a high-resolution camera or smartphone to capture spectacular views and experiences
• Pack warm outfits, like a cardigan, silk scarf, and a light jacket or sweater, to stay comfortable during cool breezes or sudden drizzles.
• Autumn coincides with Vietnam’s wedding season and peak inbound tourism season, so wedding cruise prices are higher.

Winter (November - January)

In winter, Halong Bay weather grows colder and drier with low temperatures of 12 - 21°C (54 - 70°F) and low humidity (< 65%). Accordingly, the amount of sunshine falls to 4 hours a day, making it hard to keep your body warm without a heavy jacket. 

Early mornings are often covered in mist or light fog, giving the bay a mysterious, dreamlike beauty. Rainfall is at its lowest, with only 5 - 7 rainy days per month, making the air feel crisp, though sometimes damp on the water.

Enjoy your trip uniquely in Halong Bay’s Winter.

Unlike others, winter makes Halong Bay return to its tranquil self as water activities are rarely held. Instead, tourists are offered sightseeing, relaxation on board, and the opportunity to participate in the locals' traditional jobs, such as fishing. This is the quiet season for international visitors, except around Christmas and the Lunar New Year. For those who prefer a peaceful atmosphere and unique landscapes, winter is one of the most rewarding times to experience.

>> Planning a trip during the chilly season? Don’t miss our complete guide to Halong Bay Winter: Is it a Good Time to do a Cruise?

Travel Planning

• Activities: Onboard services, joining cultural activities, and traditional fishing 

A 2D1N cruise is ideal in winter, with luxury options offering exciting onboard experiences and a serene atmosphere that perfectly matches the season’s tranquil mood. Travelers can expect a blend of onboard comfort and gentle activities such as cooking classes, squid fishing, or Tai Chi, along with leisure options like the bar, mini golf, poker, sauna, spa, and fitness center.

Some cruises also include cultural immersion experiences, and if you travel around Jan - Feb, you may even join in Tet (Vietnamese New Year) traditions.

Note: Price per person for 2D1N cruise 

Good to Know

• Prepare warm jackets, sweaters, and cold medicine to stay warm.
• Foreign visitor peak season can bring overpriced services and big crowds.
• Christmas and New Year’s Eve come with plenty of special deals and festive programs.
• November and December are the best months to visit Halong Bay for great deals and fewer domestic tourists.
• Late January to early February is the least recommended time to visit due to heavy traffic and temporary service closures during Tet.

Halong Bay Weather by Month

While each season paints a different picture of Halong Bay, many travelers want to know the specific temperature, rainfall, rainy days, and humidity throughout the year. 

Let’s explore the monthly weather patterns in Halong Bay to help you choose the best month to visit.

To check the weather forecast for Halong Bay, you can rely on several trusted websites that provide accurate and up-to-date information, such as AccuWeather and The Weather Channel. These sites offer hourly updates to help you plan your trip effectively.

Any time can be the best time to visit Halong Bay if you enjoy your trip. But when having a travel company with expert advice, I’m sure your experience on every journey will be the best.

FAQ

1. What is the best month to go to Halong Bay?

March, April, October, and November are considered the best months for pleasant weather and calm seas.

2. Is winter a good time to visit Halong Bay?

Yes, November-February offers fewer crowds and romantic misty landscapes, though temperatures are cooler (10-18 °C).

3. Which season has the calmest sea in Halong Bay?

Spring and Autumn usually have the calmest waters, ideal for overnight cruises.

4. Is it always foggy in Halong Bay?

December, January, and February has foggy days, but often in early morning. Heavy fog can reduce visibility, making sightseeing and outdoor activities more challenging. But these conditions are usually temporary and clear up as the day goes on.

5. Does it rain a lot in Halong Bay?

Rain is common in June - August, but most showers are short and usually happen in afternoon or late afternoon. Morning are usually dry, suitable for outdoor activities.

6. What happens if my cruise is canceled due to bad weather?

Each cruise operator has different policy, you may get full refunds or reschedule options. Besides, consider alternative day trips if you cruise get cancelled.

For more information, you can check this guide Halong Bay Storm & What to Do If Your Halong Bay Cruise Is Cancelled.

7. What to do in Ha Long when it rains?

There are many alternatives, cave exploration, spa onboard, cooking classes, and visiting floating villages are still available.

8. What is the cheapest month to go on a Halong Bay cruise?

May, early September, and January are budget-friendly months with frequent promotions.

9. Are there any festivals or events in Halong Bay worth joining?

Yes, Halong Carnival in April and Lunar New Year (Jan/Feb) bring vibrant cultural celebrations.

10. When is the worst time to visit Halong Bay?

July and September (storm season), there’s usually about one typhoon per month, which may cause cruise cancellations. On other days, the weather is still pleasant for sightseeing and activities.

Huan Nguyen

(Image source: Internet)