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

In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; Vientiane averages 33°C high / 24°C low with about 306 mm.

Chiang Mai vs Vientiane in September

Chiang Mai is the better pick in September — 49 vs 43 on SeasonMap's comfort score. Chiang Mai is sweltering, soaked, muggy air, while Vientiane is sweltering, soaked, clean air.

Chiang Mai vs Vientiane — September climate, side by side

	🇹🇭 Chiang Mai	🇱🇦 Vientiane
Comfort score	49/100 (F)	43/100 (F)
Feels-like high	39°C	40°C
Avg high / low	33° / 24°	33° / 24°
Rainfall	232 mm	306 mm
Rainy days	23	25
Humidity	86%	85%
Air quality (AQI)	53	37

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

Month by month

Chiang Mai vs Vientiane in September — FAQ

Is September better in Chiang Mai or Vientiane?: Chiang Mai is the better pick in September — 49 vs 43 on SeasonMap's comfort score. Chiang Mai is sweltering, soaked, muggy air, while Vientiane is sweltering, soaked, clean air.
What is the weather like in Chiang Mai vs Vientiane in September?: In September, Chiang Mai averages 33°C high / 24°C low with about 232 mm of rain; Vientiane averages 33°C high / 24°C low with about 306 mm.