What is the weather like in Aspen vs Sun Valley in September?

In September, Aspen averages 22°C high / 6°C low with about 30 mm of rain; Sun Valley averages 22°C high / 3°C low with about 30 mm.

Aspen vs Sun Valley in September

Aspen and Sun Valley are nearly tied in September — 20 vs 18 on SeasonMap's comfort score. Aspen is nice, a little rain, clean air; Sun Valley is nice, dry, clean air.

Aspen vs Sun Valley — September climate, side by side

	🇺🇸 Aspen	🇺🇸 Sun Valley
Comfort score	20/100 (F)	18/100 (F)
Feels-like high	20°C	19°C
Avg high / low	22° / 6°	22° / 3°
Rainfall	30 mm	30 mm
Rainy days	6	5
Humidity	55%	52%
Air quality (AQI)	44	40

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

Month by month

Aspen vs Sun Valley in September — FAQ

Is September better in Aspen or Sun Valley?: Aspen and Sun Valley are nearly tied in September — 20 vs 18 on SeasonMap's comfort score. Aspen is nice, a little rain, clean air; Sun Valley is nice, dry, clean air.
What is the weather like in Aspen vs Sun Valley in September?: In September, Aspen averages 22°C high / 6°C low with about 30 mm of rain; Sun Valley averages 22°C high / 3°C low with about 30 mm.