Calgary weather in September
September in Calgary: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Calgary · #128 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Calgary climate normals — September
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 31 mm / 1.2 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 57% | 🍃 comfortable |
| Dew point | 5°C / 40°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 12.6 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 3.4 cm / 1.3 in | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Calgary in September — FAQ
- Is September a good time to visit Calgary?
- September in Calgary: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Calgary on SeasonMap's comfort score (87/100).
- What is the weather like in Calgary in September?
- In September, Calgary averages a daily high of 20.4°C and a low of 7.6°C, with about 30.5 mm of rain over roughly 6.2 rainy days.
- What is the air quality in Calgary in September?
- Calgary has a mean US Air Quality Index of about 41 in September.
- Does it snow in Calgary in September?
- Calgary sees roughly 3.4 cm of snowfall in September.