August is one of the warmer months of the year in Winnipeg, with average highs near 25.8°C and lows around 13.8°C (mean 19.8°C). It is a relatively wet time of year, averaging 63 mm of rainfall and 65% relative humidity across the period.
August is one of the warmer months of the year in Winnipeg. Across 45 years of records, the warmest Augusts in Winnipeg were 1983 and 2003 — when the month averaged 22.9°C — while the coldest was 2004 at 15.3°C. Typical August days reach 25.8°C with nights near 13.8°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Winnipeg, averaging 63 mm of rainfall. The wettest August on record was 1985 with 204 mm, while the driest was 1991 at 16 mm.
Relative humidity in Winnipeg during August averages 65%. The most humid August was 2010 at 77%, and the least humid was 1990 at 55%.
August receives about 5.1 kWh/m²/day of solar energy in Winnipeg. The sunniest Augusts were 1990 and 2001 at 5.7 kWh/m²/day, and the cloudiest was 1985 at 4.3.
Average wind speed in Winnipeg during August is 2.9 m/s. The windiest August was 1995 at 3.7 m/s, while the calmest was 2017 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.7°C | 20.0°C | 19.1°C | 20.0°C | 20.7°C | +1°C |
| Avg High | 25.8°C | 26.3°C | 24.9°C | 26.0°C | 26.6°C | +0.8°C |
| Avg Low | 13.5°C | 13.8°C | 13.4°C | 14.0°C | 14.8°C | +1.3°C |
| Avg Rain | 69 mm | 57 mm | 75 mm | 57 mm | 50 mm | -19 mm |
August temperatures in Winnipeg have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 2.1°C (1982) to a record high of 38.2°C (2018).
Rainfall in August is a relatively wet time of year, averaging 63 mm, with a wettest year of 204 mm.
One of the best times to visit Winnipeg
August is one of the best times to visit Winnipeg. Expect days averaging 25.8°C and nights around 13.8°C (mean 19.8°C) — warmer than Winnipeg's yearly average — with moderate rainfall (63 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 | 26.9°C | 21.0°C | 15.0°C | 31.9°C | 9.8°C | 48 mm | 66% | 3 m/s | 4.7 |
| 2024 | 26.3°C | 20.7°C | 15.1°C | 34.3°C | 11.0°C | 47 mm | 66% | 3 m/s | 4.8 |
| 2023 | 26.3°C | 20.6°C | 14.9°C | 33.8°C | 10.3°C | 48 mm | 65% | 2.7 m/s | 4.7 |
| 2022 | 25.7°C | 20.4°C | 15.0°C | 30.2°C | 10.3°C | 43 mm | 72% | 2.7 m/s | 5.4 |
| 2021 | 27.2°C | 20.7°C | 14.3°C | 36.1°C | 7.7°C | 58 mm | 64% | 3 m/s | 4.4 |
| 2020 | 27.3°C | 20.9°C | 14.4°C | 33.1°C | 7.6°C | 58 mm | 62% | 2.9 m/s | 5.3 |
| 2019 | 26.1°C | 20.0°C | 14.0°C | 35.0°C | 8.8°C | 34 mm | 58% | 3.2 m/s | 5.3 |
| 2018 | 27.7°C | 20.9°C | 14.2°C | 38.2°C | 9.2°C | 28 mm | 57% | 2.9 m/s | 5 |
| 2017 | 25.6°C | 19.7°C | 13.8°C | 31.6°C | 7.5°C | 30 mm | 60% | 2.2 m/s | 5.2 |
| 2016 | 26.2°C | 20.0°C | 13.9°C | 31.6°C | 9.3°C | 49 mm | 67% | 2.9 m/s | 5.4 |
| 2015 | 26.0°C | 19.7°C | 13.5°C | 35.2°C | 7.2°C | 61 mm | 66% | 3 m/s | 4.9 |
| 2014 | 24.8°C | 19.3°C | 13.9°C | 31.7°C | 7.1°C | 101 mm | 72% | 2.6 m/s | 4.9 |
| 2013 | 25.7°C | 19.7°C | 13.6°C | 33.0°C | 7.3°C | 44 mm | 68% | 2.4 m/s | 5.4 |
| 2012 | 26.6°C | 20.3°C | 14.0°C | 35.3°C | 8.9°C | 60 mm | 62% | 2.8 m/s | 5.4 |
| 2011 | 26.8°C | 20.8°C | 14.8°C | 35.1°C | 10.8°C | 34 mm | 65% | 2.8 m/s | 5.6 |
| 2010 | 24.4°C | 19.1°C | 13.8°C | 31.6°C | 6.9°C | 133 mm | 77% | 3 m/s | 4.7 |
| 2009 | 22.8°C | 17.7°C | 12.5°C | 30.4°C | 7.6°C | 70 mm | 76% | 2.7 m/s | 4.6 |
| 2008 | 26.1°C | 20.1°C | 14.0°C | 32.6°C | 8.5°C | 70 mm | 66% | 3.1 m/s | 5.4 |
| 2007 | 23.9°C | 18.2°C | 12.6°C | 29.9°C | 7.5°C | 68 mm | 69% | 2.9 m/s | 5 |
| 2006 | 26.6°C | 20.4°C | 14.2°C | 33.1°C | 8.0°C | 74 mm | 62% | 3 m/s | 5.2 |
| 2005 | 22.8°C | 17.5°C | 12.1°C | 30.5°C | 6.2°C | 65 mm | 73% | 3.1 m/s | 5.1 |
| 2004 ❄️ | 20.5°C | 15.3°C | 10.1°C | 25.0°C | 4.2°C | 127 mm | 74% | 3 m/s | 4.5 |
| 2003 | 29.2°C | 22.9°C | 16.6°C | 36.3°C | 8.6°C | 57 mm | 59% | 2.9 m/s | 5.2 |
| 2002 | 25.6°C | 19.5°C | 13.5°C | 31.7°C | 8.0°C | 78 mm | 67% | 3 m/s | 4.8 |
| 2001 | 26.3°C | 20.2°C | 14.2°C | 32.4°C | 8.6°C | 39 mm | 67% | 2.8 m/s | 5.7 |
| 2000 | 24.9°C | 19.3°C | 13.7°C | 32.8°C | 7.6°C | 105 mm | 69% | 3 m/s | 5 |
| 1999 | 24.7°C | 18.9°C | 13.1°C | 31.0°C | 8.3°C | 63 mm | 67% | 2.8 m/s | 5.2 |
| 1998 | 27.1°C | 21.1°C | 15.1°C | 32.1°C | 11.0°C | 68 mm | 65% | 2.6 m/s | 5.4 |
| 1997 | 25.7°C | 19.5°C | 13.3°C | 34.1°C | 7.5°C | 57 mm | 63% | 2.9 m/s | 5.3 |
| 1996 | 27.6°C | 20.9°C | 14.1°C | 34.4°C | 10.7°C | 69 mm | 61% | 3 m/s | 5.6 |
| 1995 | 28.4°C | 21.4°C | 14.5°C | 34.4°C | 11.8°C | 56 mm | 60% | 3.7 m/s | 5.3 |
| 1994 | 25.0°C | 18.8°C | 12.5°C | 32.6°C | 7.5°C | 52 mm | 62% | 2.7 m/s | 5.2 |
| 1993 | 23.5°C | 18.4°C | 13.2°C | 29.5°C | 6.4°C | 109 mm | 75% | 3 m/s | 4.6 |
| 1992 | 24.3°C | 18.3°C | 12.3°C | 32.8°C | 5.5°C | 60 mm | 62% | 2.9 m/s | 4.9 |
| 1991 | 28.4°C | 22.0°C | 15.5°C | 36.8°C | 11.2°C | 16 mm | 56% | 2.5 m/s | 5.6 |
| 1990 | 27.8°C | 21.0°C | 14.2°C | 33.7°C | 9.9°C | 18 mm | 55% | 3 m/s | 5.7 |
| 1989 | 26.8°C | 20.4°C | 14.0°C | 37.0°C | 7.5°C | 61 mm | 61% | 2.9 m/s | 4.9 |
| 1988 | 27.2°C | 20.7°C | 14.2°C | 37.3°C | 7.7°C | 24 mm | 58% | 3.3 m/s | 4.8 |
| 1987 | 23.7°C | 18.1°C | 12.4°C | 30.8°C | 6.2°C | 65 mm | 63% | 2.9 m/s | 4.8 |
| 1986 | 24.2°C | 18.0°C | 11.8°C | 32.9°C | 4.5°C | 26 mm | 63% | 2.9 m/s | 5.4 |
| 1985 🌧️ | 21.4°C | 16.4°C | 11.4°C | 30.6°C | 6.2°C | 204 mm | 74% | 3 m/s | 4.3 |
| 1984 | 29.1°C | 22.1°C | 15.2°C | 36.8°C | 7.1°C | 20 mm | 55% | 2.9 m/s | 5.1 |
| 1983 🔥 | 29.4°C | 22.9°C | 16.5°C | 35.9°C | 11.8°C | 62 mm | 63% | 2.8 m/s | — |
| 1982 | 23.3°C | 17.7°C | 12.0°C | 28.6°C | 2.1°C | 58 mm | 66% | 3 m/s | — |
| 1981 | 26.9°C | 20.6°C | 14.3°C | 31.6°C | 8.1°C | 99 mm | 67% | 2.6 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.8°C with lows near 13.8°C (mean 19.8°C), based on 45 years of NASA POWER data.
August averages 63 mm of rainfall in Winnipeg, a relatively wet time of year. The wettest on record was 204 mm in 1985.
The hottest August reached 38.2°C in 2018. The coldest dipped to 2.1°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 26°C to 26.5°C and overnight lows from 13.9°C to 14.9°C over the same span.
August is one of the warmer months of the year in Winnipeg and a relatively wet time of year, so plan for around 25.8°C daytime highs and 13.8°C at night.
Not quite — August is the 11th coolest month in Winnipeg, averaging 19.8°C.
For August in Winnipeg, pack light layers you can adjust through the day, with typical highs of 25.8°C and lows of 13.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 65% — moderately humid.
Average wind speed in August is 2.9 m/s. The windiest August on record averaged 3.7 m/s (1995).
The wettest August on record was 1985 with 204 mm. On average, August sees 63 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 Winnipeg 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.
