What is the weather like in Mount Rainier National Park vs Seattle in September?

In September, Mount Rainier National Park averages 10°C high / 0°C low with about 71 mm of rain; Seattle averages 21°C high / 12°C low with about 36 mm.

Mount Rainier National Park vs Seattle 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 Mount Rainier National Park is cold, a little rain, clean air.

Mount Rainier National Park vs Seattle — September climate, side by side

	🇺🇸 Mount Rainier National Park	🇺🇸 Seattle
Comfort score	82/100 (A)	89/100 (A)
Feels-like high	7°C	21°C
Avg high / low	10° / 0°	21° / 12°
Rainfall	71 mm	36 mm
Rainy days	9	6
Humidity	72%	75%
Air quality (AQI)	33	40

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

Month by month

Mount Rainier National Park vs Seattle in September — FAQ

Is September better in Mount Rainier National Park or Seattle?: Seattle is the better pick in September — 89 vs 82 on SeasonMap's comfort score. Seattle is nice, a little rain, clean air, while Mount Rainier National Park is cold, a little rain, clean air.
What is the weather like in Mount Rainier National Park vs Seattle in September?: In September, Mount Rainier National Park averages 10°C high / 0°C low with about 71 mm of rain; Seattle averages 21°C high / 12°C low with about 36 mm.