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

In September, Grand Teton National Park averages 19°C high / 1°C low with about 58 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.

Grand Teton National Park vs Yellowstone National Park in September

Grand Teton National Park is the better pick in September — 89 vs 84 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air, while Yellowstone National Park is cool, a little rain, clean air.

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

	Grand Teton National Park	Yellowstone National Park
Comfort score	89/100 (A)	84/100 (A)
Feels-like high	17°C	14°C
Avg high / low	19° / 1°	17° / 1°
Rainfall	58 mm	59 mm
Rainy days	7	11
Humidity	61%	59%
Air quality (AQI)	40	43

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

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

Is September better in Grand Teton National Park or Yellowstone National Park?: Grand Teton National Park is the better pick in September — 89 vs 84 on SeasonMap's comfort score. Grand Teton National Park is nice, a little rain, clean air, while Yellowstone National Park is cool, a little rain, clean air.
What is the weather like in Grand Teton National Park vs Yellowstone National Park in September?: In September, Grand Teton National Park averages 19°C high / 1°C low with about 58 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.