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

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Louisville averages 28°C high / 17°C low with about 106 mm.

Chicago vs Louisville in September

Chicago is the better pick in September — 91 vs 83 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Louisville is hot, rainy, clean air.

Chicago vs Louisville — September climate, side by side

	🇺🇸 Chicago	🇺🇸 Louisville
Comfort score	91/100 (S)	83/100 (A)
Feels-like high	25°C	30°C
Avg high / low	25° / 17°	28° / 17°
Rainfall	63 mm	106 mm
Rainy days	7	7
Humidity	73%	71%
Air quality (AQI)	45	43

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

Month by month

Chicago vs Louisville in September — FAQ

Is September better in Chicago or Louisville?: Chicago is the better pick in September — 91 vs 83 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Louisville is hot, rainy, clean air.
What is the weather like in Chicago vs Louisville in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Louisville averages 28°C high / 17°C low with about 106 mm.