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

In September, Charleston averages 29°C high / 23°C low with about 142 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Charleston vs San Francisco in September

San Francisco is the better pick in September — 96 vs 69 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Charleston is hot, rainy, clean air.

Charleston vs San Francisco — September climate, side by side

	Charleston	San Francisco
Comfort score	69/100 (C)	96/100 (S)
Feels-like high	32°C	21°C
Avg high / low	29° / 23°	22° / 14°
Rainfall	142 mm	3 mm
Rainy days	6	1
Humidity	80%	75%
Air quality (AQI)	46	35

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

Charleston vs San Francisco in September — FAQ

Is September better in Charleston or San Francisco?: San Francisco is the better pick in September — 96 vs 69 on SeasonMap's comfort score. San Francisco is nice, dry, clean air, while Charleston is hot, rainy, clean air.
What is the weather like in Charleston vs San Francisco in September?: In September, Charleston averages 29°C high / 23°C low with about 142 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.