Ha long Bay Weather in May
During May, Ha long Bay experiences high daytime temperatures of 29°C (84°F) and cooler nights around 25°C (77°F). May sits within the rainy season, so expect regular and often heavy rainfall.
Rainfall in Ha long Bay in May
As part of the rainy season, Ha long Bay sees around 14 days of rain in May, with an average of 202 mm (8 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Ha long Bay in May
May in Ha long Bay brings high temperatures, with highs of 29°C (84°F) and nights around 25°C (77°F). This kind of day-to-night contrast is typical for this time of year. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Ha long Bay in May
Expect sunny days throughout the month, with an estimated 190 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.Should you favor a climate that's both dry and comfortably warm, January, February, March, April, November and December typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Ha long Bay's climate page.
Ha long Bay Temperature in May
Min Temperature
25°C (77°F)
Max Temperature
29°C (84°F)
Chance of Rain
45%
Precipitation
202 mm (8 in)
Rainy days
14 days
Humidity
84% *
Sunshine
190 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ha long Bay typically stay consistent throughout May, with daily highs averaging around 29°C (84°F). Nights are warm, with lows typically ranging from 23°C (73°F) to 26°C (79°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Ha long Bay in May
Browse day-by-day weather records for Ha long Bay spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ha long Bay historical weather extremes in May
According to our 32 years of weather records for Ha long Bay, the following extremes were recorded between 1994 and 2026.
- The warmest day in May was on May 21, 1998, with a maximum of 40°C (104°F).
- The coldest May day was on May 5, 2004, with a maximum of 20°C (68°F).
- The coldest night in May in Ha long Bay was on May 5, 1994, with a minimum of 17°C (63°F).
Best Places in Vietnam in May
Find out more about the weather in Vietnam and which places have the best travel conditions in this month. See all of Vietnam in May →
perfect weather
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unpleasant
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What to Wear in Ha long Bay in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Ha long Bay in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Ha long Bay's climate page.
Temperature Rainfall Sunshine Humidity
See the full Ha long Bay climate overview or explore weather in Vietnam.
