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

In September, Boston averages 24°C high / 15°C low with about 83 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.

Boston vs Washington in September

Boston is the better pick in September — 90 vs 80 on SeasonMap's comfort score. Boston is warm, rainy, clean air, while Washington is hot, rainy, clean air.

Boston vs Washington — September climate, side by side

	🇺🇸 Boston	🇺🇸 Washington
Comfort score	90/100 (S)	80/100 (A)
Feels-like high	24°C	30°C
Avg high / low	24° / 15°	28° / 17°
Rainfall	83 mm	108 mm
Rainy days	7	8
Humidity	76%	74%
Air quality (AQI)	46	47

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

Month by month

Boston 🇺🇸 United Stateswarm, rainy, clean air · best September90
Washington 🇺🇸 United Stateshot, rainy, clean air · best May80

Boston vs Washington in September — FAQ

Is September better in Boston or Washington?: Boston is the better pick in September — 90 vs 80 on SeasonMap's comfort score. Boston is warm, rainy, clean air, while Washington is hot, rainy, clean air.
What is the weather like in Boston vs Washington in September?: In September, Boston averages 24°C high / 15°C low with about 83 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.