When to go · September

Thailand in September

Best to skip this month

Phuket and Andaman coast see rough seas; many small islands close resorts entirely.

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Daytime high

32°C

90°F

Overnight low

25°C

77°F

Rainfall

335 mm

wet

Crowd levels

low

quiet

Prices

low

value window

What to expect in Thailand in September

September brings hot weather to Thailand, with daytime highs around 32°C (90°F) and overnight lows near 25°C (77°F). Skies are typically distinctly rainy, with about 335 mm of rainfall on average. Phuket and Andaman coast see rough seas; many small islands close resorts entirely..

September is a quiet stretch — most attractions are easy to access and you'll often have spaces to yourself. It's one of the best-value windows of the year for both flights and hotels. Peak season runs December–February, for context.

What’s happening in September

🎉
Sart Thai Festival · SepA Buddhist merit-making occasion when Thais offer krayasart, a sweet made from rice, sesame, peanuts, and sugar, to monks and ancestors. Southern provinces observe the related Sart Duan Sib with elaborate temple offerings.

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