Climate averages 1991–2020
Grande Prairie weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Grande Prairie: daytime highs average 16.1°C and nights cool to about 6.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 40 mm of rain on roughly 8 days, which makes September a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 48 min on an average September day.
The nearest other city in this atlas is Prince George (290 km away). In September its highs average 17.0°C, 0.9°C warmer than Grande Prairie, with 54 mm of rain.
Among the 86 cities listed in Canada, Grande Prairie ranks 85th of 86 for the warmest September highs and joint 7th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Grande Prairie is 3.7°C cooler than that mean.
From September to October, average highs fall by 7.8°C to 8.3°C, and monthly rainfall falls from 40 mm to 35 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
Grande Prairie climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -8.1°C-15.8°C | -15.8°C | 28 | 7.7 | 7.88 h |
| February | -4.7°C-13.7°C | -13.7°C | 16 | 4.8 | 9.610 h |
| March | 0.3°C-9.7°C | -9.7°C | 21 | 6.1 | 11.812 h |
| April | 8.9°C-2.2°C | -2.2°C | 25 | 6.2 | 14.114 h |
| May | 15.9°C4.6°C | 4.6°C | 40 | 7.5 | 16.116 h |
| June | 19.6°C9.8°C | 9.8°C | 73 | 11.3 | 17.317 h |
| July | 21.8°C12.1°C | 12.1°C | 77 | 11.8 | 16.817 h |
| August | 21.1°C11.2°C | 11.2°C | 47 | 8.9 | 15.015 h |
| September, selected | 16.1°C6.6°C | 6.6°C | 40 | 7.7 | 12.813 h |
| October | 8.3°C-0.1°C | -0.1°C | 35 | 7.3 | 10.511 h |
| November | -1.5°C-8.7°C | -8.7°C | 31 | 8.3 | 8.48 h |
| December | -6.9°C-14.4°C | -14.4°C | 22 | 6.2 | 7.37 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
- Prince George in SeptemberCanada · 290 kmHigh 17.0°C · Low 7.3°C · 54 mm rain
- Edmonton in SeptemberCanada · 389 kmHigh 16.7°C · Low 7.2°C · 38 mm rain
- Sherwood Park in SeptemberCanada · 400 kmHigh 16.0°C · Low 6.7°C · 38 mm rain
- Red Deer in SeptemberCanada · 460 kmHigh 16.6°C · Low 6.3°C · 41 mm rain
- Kamloops in SeptemberCanada · 511 kmHigh 21.4°C · Low 10.7°C · 35 mm rain
- Airdrie in SeptemberCanada · 534 kmHigh 16.6°C · Low 5.8°C · 45 mm rain
- Calgary in SeptemberCanada · 555 kmHigh 17.5°C · Low 5.6°C · 44 mm rain
- Kelowna in SeptemberCanada · 589 kmHigh 22.2°C · Low 12.7°C · 43 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 Grande Prairie) is explained once on the Grande Prairie year overview and on the Sources, method and limits page.