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

In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Grand Teton National Park averages 19°C high / 1°C low with about 58 mm.

Glacier National Park vs Grand Teton National Park in September

Grand Teton National Park is the better pick in September — 89 vs 85 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air, while Glacier National Park is cool, a little rain, clean air.

Glacier National Park vs Grand Teton National Park — September climate, side by side

	🇺🇸 Glacier National Park	🇺🇸 Grand Teton National Park
Comfort score	85/100 (A)	89/100 (A)
Feels-like high	11°C	17°C
Avg high / low	14° / 4°	19° / 1°
Rainfall	78 mm	58 mm
Rainy days	10	7
Humidity	65%	61%
Air quality (AQI)	37	40

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

Month by month

Glacier National Park 🇺🇸 United Statescool, a little rain, clean air · best July85
Grand Teton National Park 🇺🇸 United Statesnice, a little rain, clean air · best June89

Glacier National Park vs Grand Teton National Park in September — FAQ

Is September better in Glacier National Park or Grand Teton National Park?: Grand Teton National Park is the better pick in September — 89 vs 85 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air, while Glacier National Park is cool, a little rain, clean air.
What is the weather like in Glacier National Park vs Grand Teton National Park in September?: In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Grand Teton National Park averages 19°C high / 1°C low with about 58 mm.