Bai Tu Long Bay Weather – The Ultimate Guide 2025
Bai Tu Long Bay is a serene and picturesque corner of Vietnam. You will be enchanted with its emerald waters and limestone islands. This bay is less famous than Halong Bay, but offers similar ethereal beauty. Let’s Ha Long Bay Cheers Tours help you understand about Bai Tu Long Bay weather and best time to visit in this blog post.
1. Understand the Bai Tu Long Bay climate
Bai Tu Long, a part of the Gulf of Tonkin, is located in the Northeastern part of Vietnam and characterized by a tropical monsoon climate. The year-round warmth and high humidity levels make it an ideal spot for water activities and beach leisure activities.
The average temperature throughout the year ranges from 15°C – 25°C, with the highest temperature observed in summer months. The bay experiences high humidity (around 80%), which can make the heat feel more intense.
- The location of Bai Tu Long Bay on Google Maps: Here
Understand the Bai Tu Long Bay climate
1.1. Rainy season
First, there’s the rainy season, which typically runs from May to October. You’ll notice more rainfall during these months, especially in July and August.
But here’s the cool part: all that rain contributes to the bay’s absolutely stunning lush greenery and incredible natural diversity! Sometimes, the extra moisture can even create a beautiful, misty atmosphere, making the towering karsts look wonderfully mysterious and dreamlike.
1.2. Dry season
Then we have the dry season, stretching from November to April. This time of year is cooler and, as the name suggests, much drier. The weather in Bai Tu Long Bay during these months is super reliable, making it just perfect for all those exciting outdoor activities and explorations you’re dreaming of.
Just a friendly tip for the winter months (December to February): it can get quite chilly, so definitely pack some warm layers to stay cozy.
Bai Tu Long Bay weather by season
2. Bai Tu Long Bay weather by month in details
To truly understand the Bai Tu Long Bay weather, let’s look at what you can expect month by month, helping you pick the perfect time for your visit.
2.1. December – April
December to April mark the winter season in Bai Tu Long Bay. The weather is generally cool, with average temperatures hovering around 15°C – 20°C (59°F – 68°F).
The bay is often beautifully shrouded in mist during this time, giving it a truly mystical and ethereal feel – perfect for photography!
2.2. May – August
As spring gracefully transitions into summer, the temperatures begin to climb, reaching up to 37°C (99°F) in June. These warmer months are absolutely perfect for diving into water-based activities like swimming, kayaking, and enjoying the bay’s refreshing emerald waters.
2.3. September – November
As the bay eases into the dry season, the weather becomes wonderfully cooler and much drier. This period offers crystal-clear views of the bay’s breathtaking landscapes, making it an ideal time for photography, outdoor activities, and simply soaking in the stunning scenery without the summer heat or winter chill.
Bai Tu Long Bay weather in details
You can see the temperature, rainfall and sunshine hours in this below table:
| Month | Temperature High/Low | Rainfall | Sunshine Hours |
| January | 20°/14° | 14mm | 7 hours |
| February | 21°/15° | 22mm | 7 hours |
| March | 23°/18° | 53mm | 8 hours |
| April | 27°/21° | 57mm | 8 hours |
| May | 30°/24° | 175mm | 8 hours |
| June | 30°/24° | 172mm | 8 hours |
| July | 31°/25° | 201mm | 7 hours |
| August | 32°/25° | 265mm | 6 hours |
| September | 31°/24° | 190mm | 7 hours |
| October | 28°/21° | 54mm | 7 hours |
| November | 24°/18° | 12mm | 8 hours |
| December | 21°/15° | 23mm | 8 hours |
3. Ideal time for visiting Bai Tu Long Bay
Choosing the best time to visit Bai Tu Long Bay really depends on what kind of experience you’re hoping for.
If you’re dreaming of swimming, kayaking, and snorkeling, the warm summer months from April to June are absolutely perfect. The water is inviting, and the sunshine makes for fantastic adventures.
However, if you prefer cooler weather and want to steer clear of heavy rain, then September to October would be a much better fit for your trip.
Know Bai Tu Long Bay weather to choose the best time to visit
It’s also worth remembering that while the weather is a big factor, so are the crowds! The summer months, especially, see a noticeable increase in local tourists, which means the bay will be busier.
You can check out some popular Bai Tu Long cruise itineraries:
- 2-day, 1-night cruise
- 3-day, 2-night cruise
>> Read more:
Top 9 best choices for Bai Tu Long Bay cruises
Lan Ha Bay and Bai Tu Long Bay: Which one is better?
4. Interesting activities in Bai Tu Long Bay
After knowing the Bai Tu Long Bay weather, then what things to do here? Bai Tu Long Bay offers many fantastic activities, no matter what the weather decides to do.
During the warm summer months, the bay’s clear, emerald waters are just calling your name. It’s the perfect time to dive into water sports like:
- Cruising to discover unique islands
- Swimming
- Kayaking
- Relaxing on the wild beach
In contrast, when the weather turns cooler and drier, it’s ideal for exploring on land. You can:
- Bamboo boat rowing
- Go hiking
- Explore caves (Thien Canh Son Cave, Thay Cave)
- Visit some fishing villages (Vung Vieng fishing village, Cong Dam area)
The cooler temperatures make these adventures much more enjoyable, and those crisp, clear skies offer absolutely stunning panoramic views of the landscape.
Activities for Bai Tu Long Bay weather
Even if you encounter the wet season, your trip to Bai Tu Long Bay can still be incredibly enriching. Many cruises offer wonderful indoor activities, such as:
- Cooking classes
- Handmade workshops
- Cultural performances (dancing, ethnic fashion show)
These provide a delightful insight into local traditions and ensure you have a memorable and engaging experience, come rain or shine!
Best Halong Bay cruise deals
Understanding about the Bai Tu Long Bay weather is key to making the most of your trip. Whether you choose to visit during summer, winter or the rainy season, each offers a unique view and experience of Bai Tu Long Bay’s stunning natural beauty.
5. FAQ
Are Bai Tu Long cruises ever cancelled due to weather?
Yes, absolutely. For your safety, the Ha Long Bay Management Board (which oversees Bai Tu Long Bay as well) can and does cancel cruises due to severe weather conditions such as typhoons, storms, monsoons, or heavy fog. These decisions are typically made before 3:00 PM on the day of departure.
What should I pack for the Bai Tu Long trip?
Depends on Bai Tu Long Bay weather, you should bring: Light, breathable clothing; swimwear; sunscreen; hat; light raincoat or umbrella. Sweaters, jackets, and long pants for cooler mornings and evenings in winter.
Should I still visit Bai Tu Long during the rainy season?
You can. While there's a higher chance of rain and storms, there are also many sunny days. The bay looks incredibly lush and beautiful, and you might find fewer international tourists, potentially leading to better deals. Just be prepared for rain with a good raincoat and waterproof bags, and always keep an eye on the Bai Tu Long Bay weather forecast. Cruises are prepared to offer indoor activities like cooking classes even if it rains.
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