August is one of the warmer months of the year in Portage La Prairie, with average highs near 26°C and lows around 14.3°C (mean 20.2°C). It is a relatively wet time of year, averaging 59 mm of rainfall and 62% relative humidity across the period.
August is one of the warmer months of the year in Portage La Prairie. Across 45 years of records, the warmest August in Portage La Prairie was 1983 — when the month averaged 23.5°C — while the coldest was 2004 at 15.6°C. Typical August days reach 26°C with nights near 14.3°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Portage La Prairie, averaging 59 mm of rainfall. The wettest August on record was 1985 with 219 mm, while the driest was 1988 at 17 mm.
Relative humidity in Portage La Prairie during August averages 62%. The most humid August was 2009 at 74%, and the least humid was 1984 at 51%.
August receives about 5.2 kWh/m²/day of solar energy in Portage La Prairie. The sunniest Augusts were 2001 and 2011 at 5.8 kWh/m²/day, and the cloudiest were 1985 and 2004 at 4.3.
Average wind speed in Portage La Prairie during August is 3.2 m/s. The windiest August was 1995 at 4.1 m/s, while the calmest were 2013 and 2017 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.1°C | 20.3°C | 19.6°C | 20.3°C | 20.7°C | +0.6°C |
| Avg High | 26.0°C | 26.3°C | 25.3°C | 26.2°C | 26.4°C | +0.4°C |
| Avg Low | 14.1°C | 14.3°C | 13.9°C | 14.4°C | 15.1°C | +1°C |
| Avg Rain | 66 mm | 49 mm | 63 mm | 58 mm | 59 mm | -8 mm |
August temperatures in Portage La Prairie have risen by about 0.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3°C (1982) to a record high of 38.8°C (2018).
Rainfall in August is a relatively wet time of year, averaging 59 mm, with a wettest year of 219 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Portage La Prairie
August is one of the best times to visit Portage La Prairie. Expect days averaging 26°C and nights around 14.3°C (mean 20.2°C) — warmer than Portage La Prairie's yearly average — with moderate rainfall (59 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 | 26.8°C | 21.1°C | 15.5°C | 32.6°C | 9.9°C | 65 mm | 65% | 3.2 m/s | 4.8 |
| 2024 | 25.7°C | 20.5°C | 15.3°C | 33.6°C | 11.1°C | 47 mm | 66% | 3.2 m/s | 5 |
| 2023 | 26.3°C | 20.8°C | 15.3°C | 34.0°C | 11.0°C | 54 mm | 63% | 2.8 m/s | 4.8 |
| 2022 | 25.6°C | 20.4°C | 15.3°C | 29.7°C | 11.2°C | 43 mm | 72% | 2.9 m/s | 5.4 |
| 2021 | 26.5°C | 20.6°C | 14.6°C | 37.1°C | 8.4°C | 96 mm | 62% | 3.4 m/s | 4.4 |
| 2020 | 27.2°C | 21.0°C | 14.8°C | 33.3°C | 7.8°C | 46 mm | 59% | 3.1 m/s | 5.5 |
| 2019 | 25.8°C | 20.0°C | 14.3°C | 34.6°C | 9.7°C | 43 mm | 58% | 3.5 m/s | 5.3 |
| 2018 | 27.7°C | 21.0°C | 14.3°C | 38.8°C | 10.0°C | 23 mm | 55% | 3.1 m/s | 5.1 |
| 2017 | 25.8°C | 19.9°C | 14.1°C | 32.3°C | 8.1°C | 33 mm | 57% | 2.5 m/s | 5.4 |
| 2016 | 25.8°C | 19.9°C | 14.1°C | 31.9°C | 9.4°C | 67 mm | 65% | 3.1 m/s | 5.4 |
| 2015 | 26.5°C | 20.5°C | 14.5°C | 36.1°C | 9.4°C | 45 mm | 62% | 3.1 m/s | 5.1 |
| 2014 | 25.5°C | 20.0°C | 14.5°C | 32.3°C | 6.7°C | 96 mm | 68% | 2.9 m/s | 5 |
| 2013 | 26.0°C | 20.1°C | 14.1°C | 33.6°C | 8.5°C | 47 mm | 65% | 2.5 m/s | 5.4 |
| 2012 | 26.8°C | 20.6°C | 14.4°C | 36.0°C | 10.2°C | 60 mm | 60% | 3.1 m/s | 5.4 |
| 2011 | 27.3°C | 21.4°C | 15.4°C | 35.6°C | 11.9°C | 32 mm | 61% | 3.2 m/s | 5.8 |
| 2010 | 24.7°C | 19.4°C | 14.1°C | 33.0°C | 8.1°C | 133 mm | 74% | 3.2 m/s | 4.8 |
| 2009 | 23.0°C | 18.0°C | 12.9°C | 31.5°C | 8.1°C | 70 mm | 74% | 2.9 m/s | 4.8 |
| 2008 | 26.9°C | 20.7°C | 14.5°C | 31.7°C | 9.3°C | 76 mm | 63% | 3.3 m/s | 5.5 |
| 2007 | 24.5°C | 18.9°C | 13.2°C | 30.3°C | 8.1°C | 59 mm | 63% | 3.5 m/s | 5.1 |
| 2006 | 27.4°C | 21.1°C | 14.8°C | 34.1°C | 10.0°C | 42 mm | 57% | 3.5 m/s | 5.6 |
| 2005 | 23.6°C | 18.1°C | 12.6°C | 31.6°C | 7.9°C | 58 mm | 68% | 3.6 m/s | 5.3 |
| 2004 ❄️ | 20.6°C | 15.6°C | 10.6°C | 25.5°C | 5.2°C | 99 mm | 71% | 3.3 m/s | 4.3 |
| 2003 | 29.4°C | 23.3°C | 17.2°C | 36.8°C | 9.3°C | 47 mm | 55% | 3.2 m/s | 5.5 |
| 2002 | 25.6°C | 19.8°C | 14.0°C | 32.3°C | 8.7°C | 74 mm | 64% | 3.1 m/s | 4.8 |
| 2001 | 27.1°C | 20.9°C | 14.7°C | 33.3°C | 10.0°C | 31 mm | 62% | 3.1 m/s | 5.8 |
| 2000 | 25.1°C | 19.5°C | 14.0°C | 33.4°C | 8.1°C | 77 mm | 65% | 3.3 m/s | 5.3 |
| 1999 | 25.3°C | 19.5°C | 13.7°C | 31.9°C | 9.3°C | 66 mm | 64% | 3 m/s | 5.4 |
| 1998 | 27.3°C | 21.6°C | 15.9°C | 31.3°C | 11.1°C | 52 mm | 62% | 2.8 m/s | 5.6 |
| 1997 | 26.1°C | 20.1°C | 14.1°C | 33.9°C | 8.1°C | 62 mm | 60% | 3 m/s | 5.5 |
| 1996 | 28.0°C | 21.4°C | 14.8°C | 34.8°C | 10.3°C | 30 mm | 57% | 3.3 m/s | 5.7 |
| 1995 | 28.2°C | 21.5°C | 14.7°C | 35.1°C | 12.1°C | 40 mm | 57% | 4.1 m/s | 5.4 |
| 1994 | 24.5°C | 18.8°C | 13.1°C | 32.5°C | 8.2°C | 58 mm | 60% | 2.9 m/s | 5.1 |
| 1993 | 23.5°C | 18.4°C | 13.2°C | 30.7°C | 6.2°C | 87 mm | 72% | 3.4 m/s | 4.8 |
| 1992 | 24.7°C | 18.7°C | 12.8°C | 33.5°C | 6.7°C | 47 mm | 59% | 3 m/s | 5 |
| 1991 | 28.0°C | 21.9°C | 15.7°C | 36.4°C | 11.9°C | 17 mm | 56% | 2.8 m/s | 5.6 |
| 1990 | 27.6°C | 21.1°C | 14.7°C | 33.8°C | 10.9°C | 30 mm | 54% | 3.2 m/s | 5.6 |
| 1989 | 27.2°C | 21.0°C | 14.8°C | 38.0°C | 8.4°C | 55 mm | 56% | 3.3 m/s | 4.9 |
| 1988 | 27.2°C | 21.0°C | 14.8°C | 36.6°C | 9.4°C | 17 mm | 54% | 3.6 m/s | 4.8 |
| 1987 | 24.0°C | 18.4°C | 12.9°C | 31.4°C | 7.3°C | 67 mm | 60% | 3.3 m/s | 4.7 |
| 1986 | 24.7°C | 18.5°C | 12.3°C | 33.8°C | 5.1°C | 23 mm | 59% | 3.1 m/s | 5.7 |
| 1985 🌧️ | 21.4°C | 16.6°C | 11.8°C | 31.0°C | 7.7°C | 219 mm | 72% | 3.4 m/s | 4.3 |
| 1984 | 29.2°C | 22.6°C | 16.0°C | 36.2°C | 8.7°C | 21 mm | 51% | 3.2 m/s | 5.3 |
| 1983 🔥 | 29.9°C | 23.5°C | 17.1°C | 37.3°C | 12.4°C | 51 mm | 58% | 3 m/s | — |
| 1982 | 23.6°C | 18.1°C | 12.5°C | 30.2°C | 3.0°C | 53 mm | 65% | 3.3 m/s | — |
| 1981 | 27.2°C | 21.0°C | 14.9°C | 31.6°C | 8.7°C | 90 mm | 65% | 2.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 26°C with lows near 14.3°C (mean 20.2°C), based on 45 years of NASA POWER data.
August averages 59 mm of rainfall in Portage La Prairie, a relatively wet time of year. The wettest on record was 219 mm in 1985.
The hottest August reached 38.8°C in 2018. The coldest dipped to 3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.3°C — but days and nights have moved in opposite directions. Overnight lows rose from 14.5°C to 15.2°C while daytime highs eased from 26.3°C to 26.2°C, narrowing the gap between day and night.
August is one of the warmer months of the year in Portage La Prairie and a relatively wet time of year, so plan for around 26°C daytime highs and 14.3°C at night.
Not quite — August is the 11th coolest month in Portage La Prairie, averaging 20.2°C.
For August in Portage La Prairie, pack light layers you can adjust through the day, with typical highs of 26°C and lows of 14.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 62% — moderately humid.
Average wind speed in August is 3.2 m/s. The windiest August on record averaged 4.1 m/s (1995).
The wettest August on record was 1985 with 219 mm. On average, August sees 59 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 Portage La 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.
