What is the weather like in Philadelphia vs San Francisco in September?

In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Philadelphia vs San Francisco in September

San Francisco is the better pick in September — 96 vs 81 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Philadelphia is warm, rainy, clean air.

Philadelphia vs San Francisco — September climate, side by side

	Philadelphia	San Francisco
Comfort score	81/100 (A)	96/100 (S)
Feels-like high	28°C	21°C
Avg high / low	27° / 18°	22° / 14°
Rainfall	101 mm	3 mm
Rainy days	7	1
Humidity	72%	75%
Air quality (AQI)	45	35

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

Philadelphia vs San Francisco in September — FAQ

Is September better in Philadelphia or San Francisco?: San Francisco is the better pick in September — 96 vs 81 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Philadelphia is warm, rainy, clean air.
What is the weather like in Philadelphia vs San Francisco in September?: In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.