August is one of the warmer months of the year in Grande Prairie, with average highs near 21.5°C and lows around 9.5°C (mean 15.5°C). It is a relatively wet time of year, averaging 67 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Grande Prairie. Across 45 years of records, the warmest August in Grande Prairie was 1981 — when the month averaged 19.3°C — while the coldest was 1982 at 11.8°C. Typical August days reach 21.5°C with nights near 9.5°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Grande Prairie, averaging 67 mm of rainfall. The wettest August on record was 1989 with 170 mm, while the driest was 1981 at 10 mm.
Relative humidity in Grande Prairie during August averages 69%. The most humid August was 1989 at 82%, and the least humid was 1981 at 54%.
August receives about 4.9 kWh/m²/day of solar energy in Grande Prairie. The sunniest August was 1998 at 5.5 kWh/m²/day, and the cloudiest was 2019 at 4.
Average wind speed in Grande Prairie during August is 0.8 m/s. The windiest Augusts were 2002 and 2020 at 1 m/s, while the calmest were 2013, 2014 and 2025, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 15.7°C | 15.0°C | 15.7°C | 16.6°C | +1.6°C |
| Avg High | 21.0°C | 21.9°C | 21.0°C | 21.4°C | 22.4°C | +1.4°C |
| Avg Low | 8.9°C | 9.6°C | 8.9°C | 9.9°C | 10.8°C | +1.9°C |
| Avg Rain | 76 mm | 56 mm | 62 mm | 67 mm | 79 mm | +3 mm |
August temperatures in Grande Prairie have risen by about 1.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.8°C (1992) to a record high of 34.3°C (2008).
Rainfall in August is a relatively wet time of year, averaging 67 mm, with a wettest year of 170 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Grande Prairie
August is one of the best times to visit Grande Prairie. Expect days averaging 21.5°C and nights around 9.5°C (mean 15.5°C) — warmer than Grande Prairie's yearly average — with moderate rainfall (67 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.3°C | 17.2°C | 11.1°C | 30.9°C | 5.5°C | 80 mm | 70% | 0.7 m/s | 5.1 |
| 2024 | 22.9°C | 16.8°C | 10.6°C | 30.8°C | 6.7°C | 92 mm | 69% | 0.8 m/s | 4.7 |
| 2023 | 22.0°C | 16.5°C | 11.0°C | 28.8°C | 5.8°C | 110 mm | 74% | 0.8 m/s | 4.7 |
| 2022 | 25.0°C | 18.8°C | 12.5°C | 30.6°C | 8.2°C | 36 mm | 68% | 0.8 m/s | 5.3 |
| 2021 | 20.8°C | 15.6°C | 10.3°C | 30.5°C | 4.7°C | 92 mm | 69% | 0.9 m/s | 4.2 |
| 2020 | 20.2°C | 14.6°C | 9.1°C | 30.1°C | 4.3°C | 64 mm | 74% | 1 m/s | 5.1 |
| 2019 | 18.1°C | 13.3°C | 8.5°C | 24.1°C | 3.2°C | 119 mm | 81% | 0.8 m/s | 4 |
| 2018 | 20.6°C | 15.3°C | 10.0°C | 29.3°C | 5.1°C | 67 mm | 76% | 0.9 m/s | 4.9 |
| 2017 | 22.2°C | 16.2°C | 10.1°C | 28.7°C | 7.0°C | 40 mm | 69% | 0.9 m/s | 5.2 |
| 2016 | 21.7°C | 16.3°C | 10.8°C | 26.9°C | 4.5°C | 140 mm | 75% | 0.8 m/s | 4.3 |
| 2015 | 21.6°C | 15.7°C | 9.7°C | 27.0°C | 3.0°C | 51 mm | 65% | 0.8 m/s | 4.8 |
| 2014 | 23.2°C | 17.0°C | 10.7°C | 32.0°C | 3.5°C | 21 mm | 65% | 0.7 m/s | 5.1 |
| 2013 | 22.2°C | 16.8°C | 11.3°C | 25.9°C | 7.2°C | 58 mm | 73% | 0.7 m/s | 4.9 |
| 2012 | 23.8°C | 17.1°C | 10.4°C | 32.5°C | 5.7°C | 48 mm | 63% | 0.8 m/s | 5.2 |
| 2011 | 19.8°C | 14.3°C | 8.7°C | 23.7°C | 5.3°C | 52 mm | 74% | 0.9 m/s | 5.3 |
| 2010 | 21.0°C | 15.1°C | 9.2°C | 29.2°C | 2.8°C | 71 mm | 65% | 0.9 m/s | 4.4 |
| 2009 | 22.6°C | 15.8°C | 9.1°C | 29.9°C | 3.6°C | 39 mm | 63% | 0.8 m/s | 5.2 |
| 2008 | 22.5°C | 16.4°C | 10.2°C | 34.3°C | 2.8°C | 98 mm | 66% | 0.9 m/s | 4.8 |
| 2007 | 18.2°C | 13.2°C | 8.1°C | 26.6°C | 2.6°C | 90 mm | 77% | 0.8 m/s | 4.1 |
| 2006 | 22.7°C | 15.9°C | 9.0°C | 28.8°C | 4.8°C | 11 mm | 56% | 0.8 m/s | 5.4 |
| 2005 | 19.0°C | 13.4°C | 7.7°C | 25.7°C | 1.8°C | 49 mm | 71% | 0.8 m/s | 4.6 |
| 2004 | 20.6°C | 14.8°C | 9.1°C | 29.5°C | 3.6°C | 94 mm | 73% | 0.7 m/s | 4.6 |
| 2003 | 21.7°C | 15.6°C | 9.4°C | 29.4°C | 4.7°C | 60 mm | 66% | 0.9 m/s | 4.9 |
| 2002 | 21.2°C | 14.8°C | 8.4°C | 29.4°C | 1.9°C | 37 mm | 65% | 1 m/s | 4.9 |
| 2001 | 22.6°C | 16.1°C | 9.6°C | 30.6°C | 6.4°C | 23 mm | 69% | 0.8 m/s | 5.1 |
| 2000 | 18.7°C | 13.6°C | 8.5°C | 29.4°C | 3.0°C | 115 mm | 75% | 0.9 m/s | 4.1 |
| 1999 | 23.6°C | 16.9°C | 10.2°C | 31.1°C | 4.4°C | 26 mm | 60% | 0.8 m/s | 5.2 |
| 1998 | 24.3°C | 17.6°C | 11.0°C | 33.4°C | 6.5°C | 59 mm | 61% | 0.8 m/s | 5.5 |
| 1997 | 21.0°C | 15.3°C | 9.6°C | 31.1°C | 3.9°C | 53 mm | 75% | 0.8 m/s | 5.2 |
| 1996 | 21.2°C | 15.1°C | 9.0°C | 32.0°C | 5.4°C | 86 mm | 74% | 0.9 m/s | 5.1 |
| 1995 | 18.1°C | 12.6°C | 7.2°C | 23.8°C | 4.6°C | 43 mm | 70% | 0.8 m/s | 4.9 |
| 1994 | 22.4°C | 16.5°C | 10.5°C | 28.2°C | 6.4°C | 76 mm | 70% | 0.7 m/s | 5 |
| 1993 | 20.6°C | 14.8°C | 8.9°C | 28.3°C | 2.4°C | 56 mm | 71% | 0.7 m/s | 4.8 |
| 1992 | 22.2°C | 15.4°C | 8.7°C | 33.7°C | -0.8°C | 41 mm | 58% | 0.8 m/s | 5.2 |
| 1991 | 23.5°C | 17.3°C | 11.1°C | 31.1°C | 5.9°C | 75 mm | 67% | 0.7 m/s | 4.8 |
| 1990 | 22.0°C | 15.9°C | 9.8°C | 31.5°C | 1.2°C | 51 mm | 67% | 0.8 m/s | 4.9 |
| 1989 🌧️ | 20.2°C | 15.4°C | 10.5°C | 26.3°C | 2.1°C | 170 mm | 82% | 0.7 m/s | 4.4 |
| 1988 | 21.5°C | 15.2°C | 9.0°C | 29.3°C | 5.0°C | 46 mm | 66% | 0.9 m/s | 4.8 |
| 1987 | 17.5°C | 12.5°C | 7.5°C | 23.6°C | 3.8°C | 129 mm | 78% | 0.8 m/s | 4.6 |
| 1986 | 22.5°C | 15.5°C | 8.5°C | 29.5°C | 3.2°C | 16 mm | 61% | 0.8 m/s | 5.4 |
| 1985 | 20.3°C | 14.0°C | 7.6°C | 29.8°C | 1.5°C | 77 mm | 68% | 0.8 m/s | 4.6 |
| 1984 | 21.8°C | 15.6°C | 9.4°C | 30.9°C | 2.5°C | 67 mm | 65% | 0.9 m/s | 4.5 |
| 1983 | 21.8°C | 15.4°C | 9.1°C | 32.3°C | 4.2°C | 31 mm | 70% | 0.8 m/s | — |
| 1982 ❄️ | 16.7°C | 11.8°C | 6.9°C | 25.1°C | 2.4°C | 138 mm | 80% | 0.9 m/s | — |
| 1981 🔥 | 26.8°C | 19.3°C | 11.8°C | 33.7°C | 6.2°C | 10 mm | 54% | 0.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.5°C with lows near 9.5°C (mean 15.5°C), based on 45 years of NASA POWER data.
August averages 67 mm of rainfall in Grande Prairie, a relatively wet time of year. The wettest on record was 170 mm in 1989.
The hottest August reached 34.3°C in 2008. The coldest dipped to -0.8°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.8°C. Daytime highs moved from 21.5°C to 22.8°C and overnight lows from 9°C to 11.1°C over the same span.
August is one of the warmer months of the year in Grande Prairie and a relatively wet time of year, so plan for around 21.5°C daytime highs and 9.5°C at night.
Not quite — August is the 11th coolest month in Grande Prairie, averaging 15.5°C.
For August in Grande Prairie, pack light layers you can adjust through the day, with typical highs of 21.5°C and lows of 9.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 0.8 m/s. The windiest August on record averaged 1 m/s (2002).
The wettest August on record was 1989 with 170 mm. On average, August sees 67 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Grande Prairie behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.
