What is the weather like in Ko Samui vs Koh Rong in September?

In September, Ko Samui averages 32°C high / 25°C low with about 141 mm of rain; Koh Rong averages 29°C high / 26°C low with about 545 mm.

Ko Samui vs Koh Rong in September

Ko Samui is the better pick in September — 73 vs 51 on SeasonMap's comfort score. Ko Samui is sweltering, rainy, clean air, while Koh Rong is sweltering, soaked, clean air.

Ko Samui vs Koh Rong — September climate, side by side

	Ko Samui	Koh Rong
Comfort score	73/100 (B)	51/100 (D)
Feels-like high	37°C	35°C
Avg high / low	32° / 25°	29° / 26°
Rainfall	141 mm	545 mm
Rainy days	22	29
Humidity	79%	88%
Air quality (AQI)	27	37

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

Ko Samui vs Koh Rong in September — FAQ

Is September better in Ko Samui or Koh Rong?: Ko Samui is the better pick in September — 73 vs 51 on SeasonMap's comfort score. Ko Samui is sweltering, rainy, clean air, while Koh Rong is sweltering, soaked, clean air.
What is the weather like in Ko Samui vs Koh Rong in September?: In September, Ko Samui averages 32°C high / 25°C low with about 141 mm of rain; Koh Rong averages 29°C high / 26°C low with about 545 mm.