September in Calgary averages a daily high of 18.7°C with nights around 5°C. Expect roughly 7.6 wet days totalling 29.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Calgary is June–September.
Based on CALGARY INTERNATIONAL CS, AB CA (8.8km), 1995–2024. 24 years of September data.