What is the weather like in Chiang Mai vs San Francisco in September?

In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Chiang Mai vs San Francisco in September

San Francisco is the better pick in September — 96 vs 49 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Chiang Mai is sweltering, soaked, muggy air.

Chiang Mai vs San Francisco — September climate, side by side

	🇹🇭 Chiang Mai	🇺🇸 San Francisco
Comfort score	49/100 (F)	96/100 (S)
Feels-like high	39°C	21°C
Avg high / low	33° / 24°	22° / 14°
Rainfall	232 mm	3 mm
Rainy days	23	1
Humidity	86%	75%
Air quality (AQI)	53	35

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

Month by month

Chiang Mai vs San Francisco in September — FAQ

Is September better in Chiang Mai or San Francisco?: San Francisco is the better pick in September — 96 vs 49 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Chiang Mai is sweltering, soaked, muggy air.
What is the weather like in Chiang Mai vs San Francisco in September?: In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.