SeasonMapBoston vs Chicago in September
Boston and Chicago are nearly tied in September — 90 vs 91 on SeasonMap's comfort score. Boston is warm, rainy, clean air; Chicago is warm, a little rain, clean air.
Boston vs Chicago — September climate, side by side
| Boston | Chicago | |
|---|---|---|
| Comfort score | 90/100 (S) | 91/100 (S) |
| Feels-like high | 24°C | 25°C |
| Avg high / low | 24° / 15° | 25° / 17° |
| Rainfall | 83 mm | 63 mm |
| Rainy days | 7 | 7 |
| Humidity | 76% | 73% |
| Air quality (AQI) | 46 | 45 |
Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.
Boston vs Chicago in September — FAQ
- Is September better in Boston or Chicago?
- Boston and Chicago are nearly tied in September — 90 vs 91 on SeasonMap's comfort score. Boston is warm, rainy, clean air; Chicago is warm, a little rain, clean air.
- What is the weather like in Boston vs Chicago in September?
- In September, Boston averages 24°C high / 15°C low with about 83 mm of rain; Chicago averages 25°C high / 17°C low with about 63 mm.