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

In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.

Glacier National Park vs Yellowstone National Park in September

Glacier National Park and Yellowstone National Park are nearly tied in September — 85 vs 84 on SeasonMap's comfort score. Glacier National Park is cool, a little rain, clean air; Yellowstone National Park is cool, a little rain, clean air.

Glacier National Park vs Yellowstone National Park — September climate, side by side

	🇺🇸 Glacier National Park	🇺🇸 Yellowstone National Park
Comfort score	85/100 (A)	84/100 (A)
Feels-like high	11°C	14°C
Avg high / low	14° / 4°	17° / 1°
Rainfall	78 mm	59 mm
Rainy days	10	11
Humidity	65%	59%
Air quality (AQI)	37	43

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
Yellowstone National Park 🇺🇸 United Statescool, a little rain, clean air · best August84

Glacier National Park vs Yellowstone National Park in September — FAQ

Is September better in Glacier National Park or Yellowstone National Park?: Glacier National Park and Yellowstone National Park are nearly tied in September — 85 vs 84 on SeasonMap's comfort score. Glacier National Park is cool, a little rain, clean air; Yellowstone National Park is cool, a little rain, clean air.
What is the weather like in Glacier National Park vs Yellowstone National Park in September?: In September, Glacier National Park averages 14°C high / 4°C low with about 78 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.