What is the weather like in Boulder vs Denver in September?

In September, Boulder averages 28°C high / 10°C low with about 32 mm of rain; Denver averages 29°C high / 11°C low with about 24 mm.

Boulder vs Denver in September

Boulder and Denver are nearly tied in September — 90 vs 90 on SeasonMap's comfort score. Boulder is warm, a little rain, clean air; Denver is warm, dry, clean air.

Boulder vs Denver — September climate, side by side

	🇺🇸 Boulder	🇺🇸 Denver
Comfort score	90/100 (S)	90/100 (S)
Feels-like high	26°C	27°C
Avg high / low	28° / 10°	29° / 11°
Rainfall	32 mm	24 mm
Rainy days	4	3
Humidity	53%	46%
Air quality (AQI)	36	38

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

Month by month

Boulder 🇺🇸 United Stateswarm, a little rain, clean air · best September90
Denver 🇺🇸 United Stateswarm, dry, clean air · best September90

Boulder vs Denver in September — FAQ

Is September better in Boulder or Denver?: Boulder and Denver are nearly tied in September — 90 vs 90 on SeasonMap's comfort score. Boulder is warm, a little rain, clean air; Denver is warm, dry, clean air.
What is the weather like in Boulder vs Denver in September?: In September, Boulder averages 28°C high / 10°C low with about 32 mm of rain; Denver averages 29°C high / 11°C low with about 24 mm.