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

In September, Boston averages 24°C high / 15°C low with about 83 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Boston vs San Francisco in September

San Francisco is the better pick in September — 96 vs 90 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Boston is warm, rainy, clean air.

Boston vs San Francisco — September climate, side by side

	Boston	San Francisco
Comfort score	90/100 (S)	96/100 (S)
Feels-like high	24°C	21°C
Avg high / low	24° / 15°	22° / 14°
Rainfall	83 mm	3 mm
Rainy days	7	1
Humidity	76%	75%
Air quality (AQI)	46	35

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

Boston vs San Francisco in September — FAQ

Is September better in Boston or San Francisco?: San Francisco is the better pick in September — 96 vs 90 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Boston is warm, rainy, clean air.
What is the weather like in Boston vs San Francisco in September?: In September, Boston averages 24°C high / 15°C low with about 83 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.