SeasonMapChicago vs Napa in September
Chicago and Napa are nearly tied in September — 91 vs 88 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Napa is hot, dry, clean air.
Chicago vs Napa — September climate, side by side
| Chicago | Napa | |
|---|---|---|
| Comfort score | 91/100 (S) | 88/100 (A) |
| Feels-like high | 25°C | 30°C |
| Avg high / low | 25° / 17° | 30° / 13° |
| Rainfall | 63 mm | 5 mm |
| Rainy days | 7 | 1 |
| Humidity | 73% | 59% |
| Air quality (AQI) | 45 | 34 |
Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.
Chicago vs Napa in September — FAQ
- Is September better in Chicago or Napa?
- Chicago and Napa are nearly tied in September — 91 vs 88 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Napa is hot, dry, clean air.
- What is the weather like in Chicago vs Napa in September?
- In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Napa averages 30°C high / 13°C low with about 5 mm.