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

In September, Boulder averages 28°C high / 10°C low with about 32 mm of rain; Calgary averages 20°C high / 6°C low with about 27 mm.

Boulder vs Calgary in September

Boulder is the better pick in September — 90 vs 86 on SeasonMap's comfort score. Boulder is warm, a little rain, clean air, while Calgary is nice, dry, clean air.

Boulder vs Calgary — September climate, side by side

	🇺🇸 Boulder	🇨🇦 Calgary
Comfort score	90/100 (S)	86/100 (A)
Feels-like high	26°C	17°C
Avg high / low	28° / 10°	20° / 6°
Rainfall	32 mm	27 mm
Rainy days	4	5
Humidity	53%	63%
Air quality (AQI)	36	41

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

Month by month

Boulder 🇺🇸 United Stateswarm, a little rain, clean air · best September90
Calgary 🇨🇦 Canadanice, dry, clean air · best August86

Boulder vs Calgary in September — FAQ

Is September better in Boulder or Calgary?: Boulder is the better pick in September — 90 vs 86 on SeasonMap's comfort score. Boulder is warm, a little rain, clean air, while Calgary is nice, dry, clean air.
What is the weather like in Boulder vs Calgary in September?: In September, Boulder averages 28°C high / 10°C low with about 32 mm of rain; Calgary averages 20°C high / 6°C low with about 27 mm.