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

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Indianapolis averages 27°C high / 16°C low with about 64 mm.

Chicago vs Indianapolis in September

Chicago and Indianapolis are nearly tied in September — 91 vs 89 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Indianapolis is warm, a little rain, clean air.

Chicago vs Indianapolis — September climate, side by side

	🇺🇸 Chicago	🇺🇸 Indianapolis
Comfort score	91/100 (S)	89/100 (A)
Feels-like high	25°C	28°C
Avg high / low	25° / 17°	27° / 16°
Rainfall	63 mm	64 mm
Rainy days	7	5
Humidity	73%	68%
Air quality (AQI)	45	42

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

Month by month

Chicago vs Indianapolis in September — FAQ

Is September better in Chicago or Indianapolis?: Chicago and Indianapolis are nearly tied in September — 91 vs 89 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Indianapolis is warm, a little rain, clean air.
What is the weather like in Chicago vs Indianapolis in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Indianapolis averages 27°C high / 16°C low with about 64 mm.