What is the weather like in Chiang Mai vs Ko Samui in December?

In December, Chiang Mai averages 30°C high / 18°C low with about 8 mm of rain; Ko Samui averages 29°C high / 24°C low with about 221 mm.

Chiang Mai vs Ko Samui in December

Chiang Mai is the better pick in December — 84 vs 70 on SeasonMap's comfort score. Chiang Mai is hot, dry, while Ko Samui is hot, soaked, muggy air.

Chiang Mai vs Ko Samui — December climate, side by side

	🇹🇭 Chiang Mai	🇹🇭 Ko Samui
Comfort score	84/100 (A)	70/100 (B)
Feels-like high	33°C	33°C
Avg high / low	30° / 18°	29° / 24°
Rainfall	8 mm	221 mm
Rainy days	1	16
Humidity	74%	79%
Air quality (AQI)	79	52

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

Month by month

Chiang Mai 🇹🇭 Thailandhot, dry · best January84
Ko Samui 🇹🇭 Thailandhot, soaked, muggy air · best March70

Chiang Mai vs Ko Samui in December — FAQ

Is December better in Chiang Mai or Ko Samui?: Chiang Mai is the better pick in December — 84 vs 70 on SeasonMap's comfort score. Chiang Mai is hot, dry, while Ko Samui is hot, soaked, muggy air.
What is the weather like in Chiang Mai vs Ko Samui in December?: In December, Chiang Mai averages 30°C high / 18°C low with about 8 mm of rain; Ko Samui averages 29°C high / 24°C low with about 221 mm.