What is the weather like in Seattle vs Vancouver in September?

In September, Seattle averages 21°C high / 12°C low with about 36 mm of rain; Vancouver averages 19°C high / 12°C low with about 77 mm.

Seattle vs Vancouver in September

Seattle is the better pick in September — 89 vs 82 on SeasonMap's comfort score. Seattle is nice, a little rain, clean air, while Vancouver is nice, a little rain, clean air.

Seattle vs Vancouver — September climate, side by side

	🇺🇸 Seattle	🇨🇦 Vancouver
Comfort score	89/100 (A)	82/100 (A)
Feels-like high	21°C	19°C
Avg high / low	21° / 12°	19° / 12°
Rainfall	36 mm	77 mm
Rainy days	6	8
Humidity	75%	80%
Air quality (AQI)	40	46

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

Month by month

Seattle vs Vancouver in September — FAQ

Is September better in Seattle or Vancouver?: Seattle is the better pick in September — 89 vs 82 on SeasonMap's comfort score. Seattle is nice, a little rain, clean air, while Vancouver is nice, a little rain, clean air.
What is the weather like in Seattle vs Vancouver in September?: In September, Seattle averages 21°C high / 12°C low with about 36 mm of rain; Vancouver averages 19°C high / 12°C low with about 77 mm.