What is the weather like in Philadelphia vs Washington in September?

In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.

Philadelphia vs Washington in September

Philadelphia and Washington are nearly tied in September — 81 vs 80 on SeasonMap's comfort score. Philadelphia is warm, rainy, clean air; Washington is hot, rainy, clean air.

Philadelphia vs Washington — September climate, side by side

	🇺🇸 Philadelphia	🇺🇸 Washington
Comfort score	81/100 (A)	80/100 (A)
Feels-like high	28°C	30°C
Avg high / low	27° / 18°	28° / 17°
Rainfall	101 mm	108 mm
Rainy days	7	8
Humidity	72%	74%
Air quality (AQI)	45	47

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

Month by month

Philadelphia vs Washington in September — FAQ

Is September better in Philadelphia or Washington?: Philadelphia and Washington are nearly tied in September — 81 vs 80 on SeasonMap's comfort score. Philadelphia is warm, rainy, clean air; Washington is hot, rainy, clean air.
What is the weather like in Philadelphia vs Washington in September?: In September, Philadelphia averages 27°C high / 18°C low with about 101 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.