What is the weather like in San Francisco vs St. Louis in September?

In September, San Francisco averages 22°C high / 14°C low with about 3 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.

San Francisco vs St. Louis in September

San Francisco is the better pick in September — 96 vs 85 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while St. Louis is hot, rainy, clean air.

San Francisco vs St. Louis — September climate, side by side

	San Francisco	St. Louis
Comfort score	96/100 (S)	85/100 (A)
Feels-like high	21°C	30°C
Avg high / low	22° / 14°	29° / 15°
Rainfall	3 mm	83 mm
Rainy days	1	5
Humidity	75%	67%
Air quality (AQI)	35	50

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

San Francisco vs St. Louis in September — FAQ

Is September better in San Francisco or St. Louis?: San Francisco is the better pick in September — 96 vs 85 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while St. Louis is hot, rainy, clean air.
What is the weather like in San Francisco vs St. Louis in September?: In September, San Francisco averages 22°C high / 14°C low with about 3 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.