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

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Toronto averages 23°C high / 14°C low with about 55 mm.

Chicago vs Toronto in September

Chicago and Toronto are nearly tied in September — 91 vs 93 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Toronto is nice, a little rain, clean air.

Chicago vs Toronto — September climate, side by side

	🇺🇸 Chicago	🇨🇦 Toronto
Comfort score	91/100 (S)	93/100 (S)
Feels-like high	25°C	22°C
Avg high / low	25° / 17°	23° / 14°
Rainfall	63 mm	55 mm
Rainy days	7	7
Humidity	73%	74%
Air quality (AQI)	45	48

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

Month by month

Chicago vs Toronto in September — FAQ

Is September better in Chicago or Toronto?: Chicago and Toronto are nearly tied in September — 91 vs 93 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air; Toronto is nice, a little rain, clean air.
What is the weather like in Chicago vs Toronto in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Toronto averages 23°C high / 14°C low with about 55 mm.