Great Sand Dunes National Park vs Yellowstone National Park in September

Great Sand Dunes National Park is the better pick in September — 93 vs 84 on SeasonMap's comfort score. Great Sand Dunes National Park is nice, dry, clean air, while Yellowstone National Park is cool, a little rain, clean air.

Great Sand Dunes National Park vs Yellowstone National Park — September climate, side by side

	🇺🇸 Great Sand Dunes National Park	🇺🇸 Yellowstone National Park
Comfort score	93/100 (S)	84/100 (A)
Feels-like high	22°C	14°C
Avg high / low	24° / 9°	17° / 1°
Rainfall	24 mm	59 mm
Rainy days	4	11
Humidity	46%	59%
Air quality (AQI)	37	43

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

Month by month

Great Sand Dunes National Park 🇺🇸 United Statesnice, dry, clean air · best September93
Yellowstone National Park 🇺🇸 United Statescool, a little rain, clean air · best August84

Great Sand Dunes National Park vs Yellowstone National Park in September — FAQ

Is September better in Great Sand Dunes National Park or Yellowstone National Park?: Great Sand Dunes National Park is the better pick in September — 93 vs 84 on SeasonMap's comfort score. Great Sand Dunes National Park is nice, dry, clean air, while Yellowstone National Park is cool, a little rain, clean air.
What is the weather like in Great Sand Dunes National Park vs Yellowstone National Park in September?: In September, Great Sand Dunes National Park averages 24°C high / 9°C low with about 24 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.