What is the weather like in Grand Teton National Park vs Rocky Mountain National Park in September?

In September, Grand Teton National Park averages 19°C high / 1°C low with about 58 mm of rain; Rocky Mountain National Park averages 18°C high / 6°C low with about 41 mm.

Grand Teton National Park vs Rocky Mountain National Park in September

Grand Teton National Park and Rocky Mountain National Park are nearly tied in September — 89 vs 90 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air; Rocky Mountain National Park is cool, a little rain, clean air.

Grand Teton National Park vs Rocky Mountain National Park — September climate, side by side

	🇺🇸 Grand Teton National Park	🇺🇸 Rocky Mountain National Park
Comfort score	89/100 (A)	90/100 (S)
Feels-like high	17°C	15°C
Avg high / low	19° / 1°	18° / 6°
Rainfall	58 mm	41 mm
Rainy days	7	6
Humidity	61%	57%
Air quality (AQI)	40	40

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

Month by month

Grand Teton National Park vs Rocky Mountain National Park in September — FAQ

Is September better in Grand Teton National Park or Rocky Mountain National Park?: Grand Teton National Park and Rocky Mountain National Park are nearly tied in September — 89 vs 90 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air; Rocky Mountain National Park is cool, a little rain, clean air.
What is the weather like in Grand Teton National Park vs Rocky Mountain National Park in September?: In September, Grand Teton National Park averages 19°C high / 1°C low with about 58 mm of rain; Rocky Mountain National Park averages 18°C high / 6°C low with about 41 mm.