What is the weather like in Chicago vs Detroit in September?

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Detroit averages 25°C high / 16°C low with about 88 mm.

Chicago vs Detroit in September

Chicago and Detroit are nearly tied in September — 91 vs 90 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Detroit is warm, rainy, clean air.

Chicago vs Detroit — September climate, side by side

	🇺🇸 Chicago	🇺🇸 Detroit
Comfort score	91/100 (S)	90/100 (S)
Feels-like high	25°C	24°C
Avg high / low	25° / 17°	25° / 16°
Rainfall	63 mm	88 mm
Rainy days	7	6
Humidity	73%	73%
Air quality (AQI)	45	45

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

Month by month

Chicago vs Detroit in September — FAQ

Is September better in Chicago or Detroit?: Chicago and Detroit are nearly tied in September — 91 vs 90 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Detroit is warm, rainy, clean air.
What is the weather like in Chicago vs Detroit in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Detroit averages 25°C high / 16°C low with about 88 mm.