Halong Bay Weather in May
May marks the start of a hot summer although the heat in this month is by and large endurable. It is in fact one of the best months to visit Halong.
- Temperatures are rising in May; summer is in full swing.
- As the temperatures rise, so does the humidity! Expect it to be a bit stickier in May.
- There will be a higher chance of rain so don’t forget to pack your raincoat.
- Fewer visitors are expected in May as this is the beginning of off-peak season.
- There will be a surge of domestic visitors at the beginning of the month as a long holiday takes place.
With summer officially commencing in Halong Bay in May, the month experiences hot but manageable temperatures. The humidity tends to rise during this time, which may make you feel quite warm. Additionally, May signifies the off-peak season, witnessing a notable decrease in tourist numbers.
The enticing temperatures enhance the appeal for water-based activities such as kayaking, swimming, and snorkeling to help you cool off. However, be aware of the potential for rain and storms, which could affect your outdoor plans.
Halong Bay's Weather in May
In May, Halong Bay typically experiences hot and humid weather, though it is not excessively difficult to bear. The average temperature hovers around 33°C (91°F), with highs reaching 39°C (102°F) and lows dropping to 27°C (81°F). Nighttime temperatures decrease by about 3 to 4°C.
May boasts plentiful sunshine, providing optimal conditions for outdoor water activities. Expect around 8 to 9 hours of sun per day. Nevertheless, with higher temperatures also comes the onset of the Monsoon season, signaling a rise in both rainfall and humidity. The average humidity can average around 80%. Expect approximately 185mm of rainfall over about 13 rainy days.
Weather conditions in May can be quite variable, so it’s wise to prepare for some unforeseen weather changes. Always check weather forecasts leading up to your trip to ensure your plans are intact and go as scheduled.
May Weather Averages (Last 3 Year Summary)
Pros and Cons of Traveling to Halong Bay in May
Pros
- Warm weather and ample sunshine provide numerous opportunities for outdoor exploration and water-based adventures.
- Although rain and storms are possible, they are generally not severe during this month.
- Fewer tourists mean lower prices and less crowded attractions, enhancing your experience.
Cons
- Increasing heat and humidity can lead to a greater likelihood of rain and even typhoons, necessitating vigilance regarding weather patterns.
- The International Labor Day holiday on May 1 and Reunification Day on April 30 create one of the busiest travel periods for locals, so expect larger crowds at the beginning of the month.
Events in Halong Bay in May
In Vietnam, International Labor Day is celebrated on May 1, marking a public holiday when many businesses are closed. Additionally, Buddha's Birthday is recognized on the 8th day of the 4th Lunar month, so be aware that the specific date may vary annually around your visit.
Upcoming Labor Day Dates in Vietnam
| Dates | Types |
| Monday, May 1, 2025 | Public / National Holidays (Government offices closed) |
| Thursday, May 1, 2026 | Public / National Holidays (Government offices closed) |
| Friday, May 1, 2027 | Public / National Holidays (Government offices closed) |
The holiday period from April 30 to May 1 sees a surge in domestic visitors at major tourist sites (Photo: Shutterstock)
Best Activities in Halong Bay in May
Overnight Cruise
Taking an all-inclusive cruise getaway for either 2 days and 1 night or 3 days and 2 nights during the summer is a highlight of any trip to Halong Bay. With the peak season behind, you can find lower prices and appealing promotions.
Swimming and Kayaking
Warm sea temperatures and hot weather make for superb conditions for swimming and kayaking in May. Halong Bay offers exceptional spots such as Titop Beach, Luon Cave, Tung Sau area, and Ba Trai Dao Beach. Note that kayaking may incur an additional fee.
Squid Fishing
Squid fishing can be an exhilarating nighttime activity. Test your luck in catching squid or simply enjoy the tranquil ambiance.
Seaplane Tours
An unforgettable experience awaits those who take a seaplane to witness stunning aerial views of the bay. Remember to keep your camera handy to capture breathtaking landscapes comprising floating villages, lush islands, and soaring limestone karsts. These scenic tours are offered for 25 minutes by Hai Au Aviation.
What to Pack for Traveling Halong Bay in May
May promises hot conditions, so dress in lightweight summer attire while ensuring proper sun protection for your skin and eyes. Items such as shorts, tank tops, and flip-flops are ideal. Don’t forget sunscreen or an umbrella to prevent sunburn.
Swimwear is essential, as water activities are likely, making refreshing swims an attractive option. Considering the possibility of rain, pack a raincoat or waterproof items to stay dry!
Local Tips
May signals the start of summer heat and increased rainfall in Halong Bay. Keep these local tips in mind for a smooth and enjoyable cruise experience:
- Apply sunscreen before heading outdoors to combat the strong May sun.
- Review the weather forecast two weeks before your trip for storm updates to ensure your cruise is still on schedule.
- Book cruises and services in advance to avoid overcrowding at the start of the month, as this is a busy holiday period for locals.
