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

In September, Pittsburgh averages 26°C high / 14°C low with about 86 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.

Pittsburgh vs Washington in September

Pittsburgh is the better pick in September — 89 vs 80 on SeasonMap's comfort score. Pittsburgh is warm, rainy, clean air, while Washington is hot, rainy, clean air.

Pittsburgh vs Washington — September climate, side by side

	🇺🇸 Pittsburgh	🇺🇸 Washington
Comfort score	89/100 (A)	80/100 (A)
Feels-like high	27°C	30°C
Avg high / low	26° / 14°	28° / 17°
Rainfall	86 mm	108 mm
Rainy days	8	8
Humidity	75%	74%
Air quality (AQI)	43	47

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

Month by month

Pittsburgh vs Washington in September — FAQ

Is September better in Pittsburgh or Washington?: Pittsburgh is the better pick in September — 89 vs 80 on SeasonMap's comfort score. Pittsburgh is warm, rainy, clean air, while Washington is hot, rainy, clean air.
What is the weather like in Pittsburgh vs Washington in September?: In September, Pittsburgh averages 26°C high / 14°C low with about 86 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.