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

In September, Portland averages 24°C high / 14°C low with about 46 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.

Portland vs San Francisco in September

Portland and San Francisco are nearly tied in September — 94 vs 96 on SeasonMap's comfort score. Portland is warm, a little rain, clean air; San Francisco is nice, dry, clean air.

Portland vs San Francisco — September climate, side by side

	Portland	San Francisco
Comfort score	94/100 (S)	96/100 (S)
Feels-like high	24°C	21°C
Avg high / low	24° / 14°	22° / 14°
Rainfall	46 mm	3 mm
Rainy days	5	1
Humidity	67%	75%
Air quality (AQI)	33	35

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

Portland vs San Francisco in September — FAQ

Is September better in Portland or San Francisco?: Portland and San Francisco are nearly tied in September — 94 vs 96 on SeasonMap's comfort score. Portland is warm, a little rain, clean air; San Francisco is nice, dry, clean air.
What is the weather like in Portland vs San Francisco in September?: In September, Portland averages 24°C high / 14°C low with about 46 mm of rain; San Francisco averages 22°C high / 14°C low with about 3 mm.