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

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Pittsburgh averages 26°C high / 14°C low with about 86 mm.

Chicago vs Pittsburgh in September

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

Chicago vs Pittsburgh — September climate, side by side

	Chicago	Pittsburgh
Comfort score	91/100 (S)	89/100 (A)
Feels-like high	25°C	27°C
Avg high / low	25° / 17°	26° / 14°
Rainfall	63 mm	86 mm
Rainy days	7	8
Humidity	73%	75%
Air quality (AQI)	45	43

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

Chicago vs Pittsburgh in September — FAQ

Is September better in Chicago or Pittsburgh?: Chicago and Pittsburgh are nearly tied in September — 91 vs 89 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Pittsburgh is warm, rainy, clean air.
What is the weather like in Chicago vs Pittsburgh in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Pittsburgh averages 26°C high / 14°C low with about 86 mm.