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

In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Rocky Mountain National Park averages 18°C high / 6°C low with about 41 mm.

Glacier National Park vs Rocky Mountain National Park in September

Rocky Mountain National Park is the better pick in September — 90 vs 85 on SeasonMap's comfort score. Rocky Mountain National Park is cool, a little rain, clean air, while Glacier National Park is cool, a little rain, clean air.

Glacier National Park vs Rocky Mountain National Park — September climate, side by side

	🇺🇸 Glacier National Park	🇺🇸 Rocky Mountain National Park
Comfort score	85/100 (A)	90/100 (S)
Feels-like high	11°C	15°C
Avg high / low	14° / 4°	18° / 6°
Rainfall	78 mm	41 mm
Rainy days	10	6
Humidity	65%	57%
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
Rocky Mountain National Park 🇺🇸 United Statescool, a little rain, clean air · best August90

Glacier National Park vs Rocky Mountain National Park in September — FAQ

Is September better in Glacier National Park or Rocky Mountain National Park?: Rocky Mountain National Park is the better pick in September — 90 vs 85 on SeasonMap's comfort score. Rocky Mountain National Park is cool, 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 Rocky Mountain National Park in September?: In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Rocky Mountain National Park averages 18°C high / 6°C low with about 41 mm.