What is the weather like in Chiang Mai vs Ulaanbaatar in September?

In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; Ulaanbaatar averages 17°C high / 2°C low with about 43 mm.

Chiang Mai vs Ulaanbaatar in September

Ulaanbaatar is the better pick in September — 78 vs 49 on SeasonMap's comfort score. Ulaanbaatar is cool, a little rain, clean air, while Chiang Mai is sweltering, soaked, muggy air.

Chiang Mai vs Ulaanbaatar — September climate, side by side

	🇹🇭 Chiang Mai	🇲🇳 Ulaanbaatar
Comfort score	49/100 (F)	78/100 (B)
Feels-like high	39°C	14°C
Avg high / low	33° / 24°	17° / 2°
Rainfall	232 mm	43 mm
Rainy days	23	8
Humidity	86%	64%
Air quality (AQI)	53	36

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

Month by month

Chiang Mai vs Ulaanbaatar in September — FAQ

Is September better in Chiang Mai or Ulaanbaatar?: Ulaanbaatar is the better pick in September — 78 vs 49 on SeasonMap's comfort score. Ulaanbaatar is cool, a little rain, clean air, while Chiang Mai is sweltering, soaked, muggy air.
What is the weather like in Chiang Mai vs Ulaanbaatar in September?: In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; Ulaanbaatar averages 17°C high / 2°C low with about 43 mm.