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

In September, San Francisco averages 22°C high / 14°C low with about 3 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.

San Francisco vs Washington in September

San Francisco is the better pick in September — 96 vs 80 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Washington is hot, rainy, clean air.

San Francisco vs Washington — September climate, side by side

	San Francisco	Washington
Comfort score	96/100 (S)	80/100 (A)
Feels-like high	21°C	30°C
Avg high / low	22° / 14°	28° / 17°
Rainfall	3 mm	108 mm
Rainy days	1	8
Humidity	75%	74%
Air quality (AQI)	35	47

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

San Francisco vs Washington in September — FAQ

Is September better in San Francisco or Washington?: San Francisco is the better pick in September — 96 vs 80 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Washington is hot, rainy, clean air.
What is the weather like in San Francisco vs Washington in September?: In September, San Francisco averages 22°C high / 14°C low with about 3 mm of rain; Washington averages 28°C high / 17°C low with about 108 mm.