What is the weather like in Half Moon Bay vs San Francisco in September?

In September, Half Moon Bay averages 22°C high / 13°C low with about 12 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Half Moon Bay vs San Francisco in September

San Francisco is the better pick in September — 96 vs 87 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Half Moon Bay is nice, dry, clean air.

Half Moon Bay vs San Francisco — September climate, side by side

	🇺🇸 Half Moon Bay	🇺🇸 San Francisco
Comfort score	87/100 (A)	96/100 (S)
Feels-like high	22°C	21°C
Avg high / low	22° / 13°	22° / 14°
Rainfall	12 mm	3 mm
Rainy days	3	1
Humidity	83%	75%
Air quality (AQI)	43	35

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

Month by month

Half Moon Bay vs San Francisco in September — FAQ

Is September better in Half Moon Bay or San Francisco?: San Francisco is the better pick in September — 96 vs 87 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Half Moon Bay is nice, dry, clean air.
What is the weather like in Half Moon Bay vs San Francisco in September?: In September, Half Moon Bay averages 22°C high / 13°C low with about 12 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.