What is the weather like in Chicago vs San Francisco in October?

In October, Chicago averages 18°C high / 9°C low with about 117 mm of rain; San Francisco averages 21°C high / 13°C low with about 29 mm.

Chicago vs San Francisco in October

San Francisco is the better pick in October — 90 vs 73 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Chicago is nice, rainy, clean air.

Chicago vs San Francisco — October climate, side by side

	Chicago	San Francisco
Comfort score	73/100 (B)	90/100 (S)
Feels-like high	16°C	21°C
Avg high / low	18° / 9°	21° / 13°
Rainfall	117 mm	29 mm
Rainy days	10	2
Humidity	70%	71%
Air quality (AQI)	35	40

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

Chicago vs San Francisco in October — FAQ

Is October better in Chicago or San Francisco?: San Francisco is the better pick in October — 90 vs 73 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Chicago is nice, rainy, clean air.
What is the weather like in Chicago vs San Francisco in October?: In October, Chicago averages 18°C high / 9°C low with about 117 mm of rain; San Francisco averages 21°C high / 13°C low with about 29 mm.