Climate averages 1991–2020
Red Deer weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Red Deer: daytime highs average 16.6°C and nights cool to about 6.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 41 mm of rain on roughly 8 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 43 min on an average September day.
The nearest other city in this atlas is Airdrie (109 km away). In September its highs average 16.6°C, about as warm as Red Deer, with 45 mm of rain.
Among the 86 cities listed in Canada, Red Deer ranks joint 82nd of 86 for the warmest September highs and 9th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Red Deer is 3.2°C cooler than that mean.
From September to October, average highs fall by 7.4°C to 9.1°C, and monthly rainfall falls from 41 mm to 24 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Red Deer climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -5.6°C-15.3°C | -15.3°C | 17 | 4.9 | 8.38 h |
| February | -2.6°C-13.5°C | -13.5°C | 11 | 3.3 | 9.910 h |
| March | 2.3°C-8.6°C | -8.6°C | 20 | 5.8 | 11.812 h |
| April | 9.4°C-2.0°C | -2.0°C | 33 | 7.2 | 13.914 h |
| May | 15.5°C4.1°C | 4.1°C | 63 | 10.3 | 15.716 h |
| June | 19.1°C9.1°C | 9.1°C | 91 | 14.1 | 16.717 h |
| July | 22.0°C11.9°C | 11.9°C | 83 | 12.9 | 16.316 h |
| August | 21.4°C11.2°C | 11.2°C | 67 | 9.9 | 14.715 h |
| September, selected | 16.6°C6.3°C | 6.3°C | 41 | 8.0 | 12.713 h |
| October | 9.1°C-0.5°C | -0.5°C | 24 | 5.8 | 10.711 h |
| November | 0.4°C-8.2°C | -8.2°C | 21 | 5.3 | 8.89 h |
| December | -5.1°C-14.2°C | -14.2°C | 15 | 4.6 | 7.88 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Airdrie in SeptemberCanada · 109 kmHigh 16.6°C · Low 5.8°C · 45 mm rain
- Calgary in SeptemberCanada · 137 kmHigh 17.5°C · Low 5.6°C · 44 mm rain
- Sherwood Park in SeptemberCanada · 143 kmHigh 16.0°C · Low 6.7°C · 38 mm rain
- Edmonton in SeptemberCanada · 144 kmHigh 16.7°C · Low 7.2°C · 38 mm rain
- Lethbridge in SeptemberCanada · 294 kmHigh 19.7°C · Low 8.3°C · 37 mm rain
- Grande Prairie in SeptemberCanada · 460 kmHigh 16.1°C · Low 6.6°C · 40 mm rain
- Kelowna in SeptemberCanada · 477 kmHigh 22.2°C · Low 12.7°C · 43 mm rain
- Kamloops in SeptemberCanada · 485 kmHigh 21.4°C · Low 10.7°C · 35 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Red Deer) is explained once on the Red Deer year overview and on the Sources, method and limits page.