What is the weather like in Chicago vs San Antonio in September?

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; San Antonio averages 35°C high / 22°C low with about 85 mm.

Chicago vs San Antonio in September

Chicago is the better pick in September — 91 vs 64 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while San Antonio is sweltering, rainy, clean air.

Chicago vs San Antonio — September climate, side by side

	Chicago	San Antonio
Comfort score	91/100 (S)	64/100 (C)
Feels-like high	25°C	37°C
Avg high / low	25° / 17°	35° / 22°
Rainfall	63 mm	85 mm
Rainy days	7	5
Humidity	73%	65%
Air quality (AQI)	45	42

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

Chicago vs San Antonio in September — FAQ

Is September better in Chicago or San Antonio?: Chicago is the better pick in September — 91 vs 64 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while San Antonio is sweltering, rainy, clean air.
What is the weather like in Chicago vs San Antonio in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; San Antonio averages 35°C high / 22°C low with about 85 mm.