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

In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; San Antonio averages 35°C high / 22°C low with about 85 mm.

Philadelphia vs San Antonio in September

Philadelphia is the better pick in September — 81 vs 64 on SeasonMap's comfort score. Philadelphia is warm, rainy, clean air, while San Antonio is sweltering, rainy, clean air.

Philadelphia vs San Antonio — September climate, side by side

	Philadelphia	San Antonio
Comfort score	81/100 (A)	64/100 (C)
Feels-like high	28°C	37°C
Avg high / low	27° / 18°	35° / 22°
Rainfall	101 mm	85 mm
Rainy days	7	5
Humidity	72%	65%
Air quality (AQI)	45	42

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

Philadelphia vs San Antonio in September — FAQ

Is September better in Philadelphia or San Antonio?: Philadelphia is the better pick in September — 81 vs 64 on SeasonMap's comfort score. Philadelphia is warm, rainy, clean air, while San Antonio is sweltering, rainy, clean air.
What is the weather like in Philadelphia vs San Antonio in September?: In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; San Antonio averages 35°C high / 22°C low with about 85 mm.