Climate averages 1991–2020
Calgary weather
in August.
A warm, moderately wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Calgary: daytime highs average 22.3°C and nights cool to about 10.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 63 mm of rain on roughly 10 days, which makes August a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 34 min on an average August day.
The nearest other city in this atlas is Airdrie (28 km away). In August its highs average 21.4°C, 0.9°C cooler than Calgary, with 68 mm of rain.
Among the 86 cities listed in Canada, Calgary ranks joint 70th of 86 for the warmest August highs and 16th of 86 for the driest August (rainfall, lowest first). The mean August high of those 86 cities is 23.8°C; Calgary is 1.5°C cooler than that mean.
From August to September, average highs fall by 4.8°C to 17.5°C, and monthly rainfall falls from 63 mm to 44 mm.
The annual picture
August 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
Calgary climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.9°C-13.1°C | -13.1°C | 12 | 3.7 | 8.58 h |
| February | 0.0°C-11.4°C | -11.4°C | 12 | 3.7 | 10.010 h |
| March | 4.2°C-7.6°C | -7.6°C | 21 | 5.5 | 11.812 h |
| April | 10.1°C-2.2°C | -2.2°C | 38 | 8.0 | 13.814 h |
| May | 15.7°C3.0°C | 3.0°C | 72 | 11.3 | 15.516 h |
| June | 19.1°C7.8°C | 7.8°C | 104 | 13.7 | 16.516 h |
| July | 22.7°C10.8°C | 10.8°C | 61 | 10.8 | 16.116 h |
| August, selected | 22.3°C10.1°C | 10.1°C | 63 | 9.5 | 14.615 h |
| September | 17.5°C5.6°C | 5.6°C | 44 | 7.9 | 12.713 h |
| October | 10.2°C-0.7°C | -0.7°C | 24 | 6.2 | 10.811 h |
| November | 2.1°C-7.1°C | -7.1°C | 19 | 4.9 | 9.09 h |
| December | -2.8°C-12.5°C | -12.5°C | 14 | 3.7 | 8.08 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
August in nearby cities
- Airdrie in AugustCanada · 28 kmHigh 21.4°C · Low 10.3°C · 68 mm rain
- Red Deer in AugustCanada · 137 kmHigh 21.4°C · Low 11.2°C · 67 mm rain
- Lethbridge in AugustCanada · 175 kmHigh 25.2°C · Low 12.8°C · 35 mm rain
- Sherwood Park in AugustCanada · 279 kmHigh 21.0°C · Low 11.6°C · 59 mm rain
- Edmonton in AugustCanada · 281 kmHigh 21.7°C · Low 12.1°C · 58 mm rain
- Kelowna in AugustCanada · 404 kmHigh 27.8°C · Low 16.5°C · 25 mm rain
- Spokane Valley in AugustUnited States · 439 kmHigh 28.7°C · Low 15.1°C · 14 mm rain
- Kamloops in AugustCanada · 440 kmHigh 27.2°C · Low 15.3°C · 23 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 Calgary) is explained once on the Calgary year overview and on the Sources, method and limits page.