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

In September, Mount Rainier National Park averages 10°C high / 0°C low with about 71 mm of rain; Portland averages 24°C high / 14°C low with about 46 mm.

Mount Rainier National Park vs Portland in September

Portland is the better pick in September — 94 vs 82 on SeasonMap's comfort score. Portland is warm, a little rain, clean air, while Mount Rainier National Park is cold, a little rain, clean air.

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

	🇺🇸 Mount Rainier National Park	🇺🇸 Portland
Comfort score	82/100 (A)	94/100 (S)
Feels-like high	7°C	24°C
Avg high / low	10° / 0°	24° / 14°
Rainfall	71 mm	46 mm
Rainy days	9	5
Humidity	72%	67%
Air quality (AQI)	33	33

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

Month by month

Mount Rainier National Park vs Portland in September — FAQ

Is September better in Mount Rainier National Park or Portland?: Portland is the better pick in September — 94 vs 82 on SeasonMap's comfort score. Portland is warm, 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 Portland in September?: In September, Mount Rainier National Park averages 10°C high / 0°C low with about 71 mm of rain; Portland averages 24°C high / 14°C low with about 46 mm.