What is the weather like in Bangkok vs Ko Samui in September?

In September, Bangkok averages 33°C high / 26°C low with about 254 mm of rain; Ko Samui averages 32°C high / 25°C low with about 141 mm.

Bangkok vs Ko Samui in September

Ko Samui is the better pick in September — 73 vs 46 on SeasonMap's comfort score. Ko Samui is sweltering, rainy, clean air, while Bangkok is sweltering, soaked, muggy air.

Bangkok vs Ko Samui — September climate, side by side

	🇹🇭 Bangkok	🇹🇭 Ko Samui
Comfort score	46/100 (F)	73/100 (B)
Feels-like high	39°C	37°C
Avg high / low	33° / 26°	32° / 25°
Rainfall	254 mm	141 mm
Rainy days	26	22
Humidity	82%	79%
Air quality (AQI)	60	27

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Bangkok vs Ko Samui in September — FAQ

Is September better in Bangkok or Ko Samui?: Ko Samui is the better pick in September — 73 vs 46 on SeasonMap's comfort score. Ko Samui is sweltering, rainy, clean air, while Bangkok is sweltering, soaked, muggy air.
What is the weather like in Bangkok vs Ko Samui in September?: In September, Bangkok averages 33°C high / 26°C low with about 254 mm of rain; Ko Samui averages 32°C high / 25°C low with about 141 mm.