Thailand weather in May
In May, Thailand averages 31 to 33°C by day across Phuket and Bangkok. Bangkok is the warmest at 33°C, Phuket the coolest at 31°C. The sea is 31°C.
Thailand in May, place by place
Warmest first. Anywhere at 24°C or more is proper beach weather. Tap a place for its full May detail.
Heading to Thailand in May?
Share the places you've saved on TikTok and Instagram for Thailand to Dream Trip. It pins them on a map and builds your days around them.
Thailand in May: quick answers
Is Thailand hot in May?
In May, Thailand averages 31 to 33°C by day across Phuket and Bangkok. Bangkok is the warmest at 33°C, Phuket the coolest at 31°C. The sea is 31°C. May is hot but wet in Bangkok: rainy season, so pack for showers.
Where is warmest in Thailand in May?
Bangkok, at an average high of 33°C. The driest is Bangkok, with about 176 mm of rain.
Can you swim in the sea in Thailand in May?
Yes: Phuket (31°C) has sea temperatures of 21°C or more, comfortable without a wetsuit.
How we measured this
Thailand here means Phuket and Bangkok: the places we measure. Figures are averages of every day from 2016 to 2025 from the Open-Meteo historical weather archive (ECMWF ERA5); sea temperatures are 2023 to 2025 averages. Rain is the average monthly total, and 150 mm or more counts as rainy season.
Planning Thailand in May?
Save the places you find on TikTok and Instagram for Thailand to one map, and Dream Trip turns them into a day-by-day plan.
