Calgary weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Calgary in September?
In September, Calgary is mild: daytime highs average 18 °C, and nights cool down to about 6 °C. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 41 mm. All in all, September is an excellent month for a holiday in Calgary.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 87 | 85 | 48 |
| Day | 23° | 18° | 11° |
| Night | 10° | 6° | −1° |
| Sun | 9 h | 7 h | 5 h |
| Rain days | 9 | 8 | 6 |
More details for September
- Daylight
- 12 h 44 min07:10 – 19:54
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 50 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snowAll months
- Time zone
- UTC−6America/Edmonton
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 30 %72 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- A jumper for the evenings
Calgary in September: quick answers
Is Calgary hot in September?
No. In September, Calgary is mild: daytime highs average 18 °C and nights drop to about 6 °C.
Does it rain much in Calgary in September?
Rain falls on about 8 days, adding up to 41 mm.
Calgary month by month
The whole year in CalgaryAll destinations: CanadaWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences