Chiang Mai vs San Francisco in September
San Francisco is the better pick in September — 92 vs 54 on SeasonMap's comfort score. San Francisco is warm, dry, clean air, while Chiang Mai is sweltering, soaked, very humid.
Chiang Mai vs San Francisco — September climate, side by side
| Chiang Mai | San Francisco | |
|---|---|---|
| Comfort score | 54/100 (D) | 92/100 (S) |
| Feels-like high | 36°C | 24°C |
| Avg high / low | 30° / 23° | 24° / 14° |
| Rainfall | 237 mm | 4 mm |
| Rainy days | 23 | 0 |
| Humidity | 87% | 77% |
| Air quality (AQI) | 53 | 35 |
Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.
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 — 92 vs 54 on SeasonMap's comfort score. San Francisco is warm, dry, clean air, while Chiang Mai is sweltering, soaked, very humid.
- What is the weather like in Chiang Mai vs San Francisco in September?
- In September, Chiang Mai averages 30°C high / 23°C low with about 237 mm of rain; San Francisco averages 24°C high / 14°C low with about 4 mm.