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

In September, Aspen averages 22°C high / 6°C low with about 30 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.

Aspen vs Yellowstone National Park in September

Yellowstone National Park is the better pick in September — 84 vs 20 on SeasonMap's comfort score. Yellowstone National Park is cool, a little rain, clean air, while Aspen is nice, a little rain, clean air.

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

	🇺🇸 Aspen	🇺🇸 Yellowstone National Park
Comfort score	20/100 (F)	84/100 (A)
Feels-like high	20°C	14°C
Avg high / low	22° / 6°	17° / 1°
Rainfall	30 mm	59 mm
Rainy days	6	11
Humidity	55%	59%
Air quality (AQI)	44	43

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

Month by month

Aspen vs Yellowstone National Park in September — FAQ

Is September better in Aspen or Yellowstone National Park?: Yellowstone National Park is the better pick in September — 84 vs 20 on SeasonMap's comfort score. Yellowstone National Park is cool, a little rain, clean air, while Aspen is nice, a little rain, clean air.
What is the weather like in Aspen vs Yellowstone National Park in September?: In September, Aspen averages 22°C high / 6°C low with about 30 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.