Thailand weather in January
In January, Thailand averages 30 to 32°C by day across Phuket and Bangkok. Bangkok is the warmest at 32°C, Phuket the coolest at 30°C. The sea is 29°C.
Thailand in January, place by place
Warmest first. Anywhere at 24°C or more is proper beach weather. Tap a place for its full January detail.
Heading to Thailand in January?
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 January: quick answers
Is Thailand hot in January?
In January, Thailand averages 30 to 32°C by day across Phuket and Bangkok. Bangkok is the warmest at 32°C, Phuket the coolest at 30°C. The sea is 29°C. January is hot in Bangkok: proper beach weather.
Where is warmest in Thailand in January?
Bangkok, at an average high of 32°C. The driest is Bangkok, with about 23 mm of rain.
Can you swim in the sea in Thailand in January?
Yes: Phuket (29°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 January?
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.
