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

In September, Katmai National Park averages 11°C high / 7°C low with about 139 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.

Katmai National Park vs Yellowstone National Park in September

Yellowstone National Park is the better pick in September — 84 vs 75 on SeasonMap's comfort score. Yellowstone National Park is cool, a little rain, clean air, while Katmai National Park is cool, rainy, clean air.

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

	🇺🇸 Katmai National Park	🇺🇸 Yellowstone National Park
Comfort score	75/100 (B)	84/100 (A)
Feels-like high	10°C	14°C
Avg high / low	11° / 7°	17° / 1°
Rainfall	139 mm	59 mm
Rainy days	18	11
Humidity	87%	59%
Air quality (AQI)	24	43

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

Month by month

Katmai National Park 🇺🇸 United Statescool, rainy, clean air · best June75
Yellowstone National Park 🇺🇸 United Statescool, a little rain, clean air · best August84

Katmai National Park vs Yellowstone National Park in September — FAQ

Is September better in Katmai National Park or Yellowstone National Park?: Yellowstone National Park is the better pick in September — 84 vs 75 on SeasonMap's comfort score. Yellowstone National Park is cool, a little rain, clean air, while Katmai National Park is cool, rainy, clean air.
What is the weather like in Katmai National Park vs Yellowstone National Park in September?: In September, Katmai National Park averages 11°C high / 7°C low with about 139 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.