August is one of the warmer months of the year in Trois-Rivières, with average highs near 23.4°C and lows around 13.3°C (mean 18.4°C). It is a relatively wet time of year, averaging 97 mm of rainfall and 81% relative humidity across the period.
August is one of the warmer months of the year in Trois-Rivières. Across 45 years of records, the warmest August in Trois-Rivières was 2021 — when the month averaged 21.8°C — while the coldest was 1982 at 15.3°C. Typical August days reach 23.4°C with nights near 13.3°C. The long-term trend is warming, about 0.5°C per decade.
August is a relatively wet time of year in Trois-Rivières, averaging 97 mm of rainfall. The wettest August on record was 1988 with 170 mm, while the driest was 2021 at 23 mm.
Relative humidity in Trois-Rivières during August averages 81%. The most humid August was 2015 at 84%, and the least humid was 2025 at 69%.
August receives about 4.9 kWh/m²/day of solar energy in Trois-Rivières. The sunniest August was 1984 at 5.5 kWh/m²/day, and the cloudiest was 1988 at 4.2.
Average wind speed in Trois-Rivières during August is 0.3 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest were 2006, 2015 and 2021, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.4°C | 18.1°C | 18.3°C | 18.9°C | 19.5°C | +2.1°C |
| Avg High | 22.5°C | 23.3°C | 23.3°C | 23.6°C | 24.8°C | +2.3°C |
| Avg Low | 12.3°C | 12.9°C | 13.4°C | 14.1°C | 14.3°C | +2°C |
| Avg Rain | 107 mm | 94 mm | 97 mm | 100 mm | 85 mm | -22 mm |
August temperatures in Trois-Rivières have risen by about 2.2°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.8°C (1986) to a record high of 33.6°C (2025).
Rainfall in August is a relatively wet time of year, averaging 97 mm, with a wettest year of 170 mm.
One of the best times to visit Trois-Rivières
August is one of the best times to visit Trois-Rivières. Expect days averaging 23.4°C and nights around 13.3°C (mean 18.4°C) — warmer than Trois-Rivières's yearly average — with higher rainfall (97 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 | 25.8°C | 19.6°C | 13.5°C | 33.6°C | 6.8°C | 50 mm | 69% | 0.3 m/s | 5.4 |
| 2024 | 24.9°C | 19.6°C | 14.4°C | 32.2°C | 8.4°C | 116 mm | 78% | 0.3 m/s | 4.4 |
| 2023 | 23.3°C | 18.2°C | 13.1°C | 26.7°C | 7.8°C | 107 mm | 81% | 0.3 m/s | 4.5 |
| 2022 | 24.9°C | 19.5°C | 14.2°C | 31.6°C | 9.3°C | 97 mm | 78% | 0.3 m/s | 4.8 |
| 2021 🔥 | 26.8°C | 21.8°C | 16.7°C | 31.2°C | 11.0°C | 23 mm | 77% | 0.2 m/s | 4.8 |
| 2020 | 23.0°C | 18.4°C | 13.8°C | 28.3°C | 6.5°C | 117 mm | 82% | 0.3 m/s | 4.9 |
| 2019 | 23.4°C | 18.4°C | 13.4°C | 29.6°C | 9.3°C | 101 mm | 83% | 0.3 m/s | 5.2 |
| 2018 | 25.1°C | 20.3°C | 15.5°C | 28.3°C | 8.3°C | 84 mm | 83% | 0.3 m/s | 4.8 |
| 2017 | 22.1°C | 17.5°C | 12.8°C | 26.1°C | 7.8°C | 83 mm | 82% | 0.3 m/s | 5 |
| 2016 | 24.7°C | 19.9°C | 15.2°C | 28.2°C | 9.0°C | 95 mm | 83% | 0.3 m/s | 5.1 |
| 2015 | 23.8°C | 19.2°C | 14.6°C | 29.8°C | 9.7°C | 97 mm | 84% | 0.2 m/s | 4.7 |
| 2014 | 23.2°C | 18.6°C | 13.9°C | 29.3°C | 9.4°C | 96 mm | 82% | 0.3 m/s | 5 |
| 2013 | 22.8°C | 17.9°C | 13.1°C | 28.0°C | 8.4°C | 87 mm | 83% | 0.3 m/s | 4.8 |
| 2012 | 23.9°C | 19.2°C | 14.5°C | 28.0°C | 9.6°C | 125 mm | 83% | 0.3 m/s | 4.8 |
| 2011 | 23.3°C | 18.8°C | 14.2°C | 28.3°C | 8.7°C | 163 mm | 84% | 0.3 m/s | 4.7 |
| 2010 | 23.6°C | 18.7°C | 13.9°C | 30.5°C | 8.2°C | 67 mm | 82% | 0.3 m/s | 4.9 |
| 2009 | 23.3°C | 18.7°C | 14.1°C | 28.1°C | 6.2°C | 74 mm | 83% | 0.3 m/s | 4.8 |
| 2008 | 23.0°C | 18.1°C | 13.2°C | 28.1°C | 8.5°C | 105 mm | 83% | 0.3 m/s | 4.6 |
| 2007 | 22.9°C | 17.4°C | 11.8°C | 29.6°C | 5.7°C | 92 mm | 81% | 0.3 m/s | 5.1 |
| 2006 | 22.2°C | 17.1°C | 12.1°C | 29.2°C | 6.4°C | 132 mm | 81% | 0.2 m/s | 5.1 |
| 2005 | 23.8°C | 18.9°C | 14.0°C | 27.5°C | 8.2°C | 123 mm | 82% | 0.3 m/s | 5 |
| 2004 | 22.5°C | 17.7°C | 12.9°C | 26.6°C | 6.4°C | 84 mm | 83% | 0.3 m/s | 4.6 |
| 2003 | 24.1°C | 19.4°C | 14.7°C | 30.1°C | 6.4°C | 103 mm | 82% | 0.3 m/s | 4.5 |
| 2002 | 24.2°C | 19.1°C | 14.1°C | 29.2°C | 7.9°C | 44 mm | 81% | 0.3 m/s | 5.4 |
| 2001 | 24.5°C | 19.2°C | 13.9°C | 29.3°C | 7.5°C | 93 mm | 80% | 0.3 m/s | 5 |
| 2000 | 22.6°C | 17.7°C | 12.8°C | 25.9°C | 6.8°C | 123 mm | 83% | 0.3 m/s | 4.6 |
| 1999 | 23.2°C | 17.9°C | 12.7°C | 28.9°C | 7.8°C | 71 mm | 78% | 0.3 m/s | 5.1 |
| 1998 | 24.3°C | 19.0°C | 13.8°C | 29.0°C | 8.8°C | 67 mm | 78% | 0.3 m/s | 5.2 |
| 1997 | 22.2°C | 17.2°C | 12.2°C | 28.1°C | 8.3°C | 98 mm | 80% | 0.3 m/s | 4.8 |
| 1996 | 23.7°C | 18.1°C | 12.4°C | 28.1°C | 7.0°C | 81 mm | 80% | 0.3 m/s | 5.4 |
| 1995 | 24.2°C | 18.5°C | 12.7°C | 28.8°C | 7.1°C | 87 mm | 78% | 0.3 m/s | 5.3 |
| 1994 | 22.1°C | 16.8°C | 11.5°C | 26.6°C | 6.7°C | 101 mm | 81% | 0.3 m/s | 5.1 |
| 1993 | 24.3°C | 19.3°C | 14.3°C | 30.6°C | 7.5°C | 83 mm | 83% | 0.3 m/s | 4.9 |
| 1992 | 21.8°C | 17.0°C | 12.1°C | 27.5°C | 7.3°C | 96 mm | 84% | 0.3 m/s | 4.6 |
| 1991 | 23.9°C | 18.8°C | 13.7°C | 29.4°C | 7.9°C | 140 mm | 83% | 0.3 m/s | 4.9 |
| 1990 | 23.6°C | 18.6°C | 13.5°C | 27.6°C | 6.8°C | 113 mm | 83% | 0.3 m/s | 5.1 |
| 1989 | 22.6°C | 17.5°C | 12.4°C | 28.6°C | 4.5°C | 103 mm | 82% | 0.3 m/s | 5 |
| 1988 🌧️ | 22.8°C | 18.3°C | 13.7°C | 29.7°C | 6.5°C | 170 mm | 84% | 0.3 m/s | 4.2 |
| 1987 | 22.2°C | 16.8°C | 11.4°C | 29.1°C | 5.1°C | 61 mm | 78% | 0.3 m/s | 4.9 |
| 1986 | 22.0°C | 16.7°C | 11.4°C | 26.6°C | 3.8°C | 141 mm | 83% | 0.3 m/s | 4.7 |
| 1985 | 22.0°C | 16.8°C | 11.7°C | 26.1°C | 6.7°C | 62 mm | 81% | 0.3 m/s | 4.7 |
| 1984 | 24.1°C | 19.3°C | 14.4°C | 27.5°C | 7.6°C | 108 mm | 84% | 0.2 m/s | 5.5 |
| 1983 | 23.4°C | 18.3°C | 13.1°C | 27.4°C | 6.8°C | 76 mm | 82% | 0.3 m/s | — |
| 1982 ❄️ | 20.4°C | 15.3°C | 10.2°C | 25.8°C | 4.1°C | 117 mm | 80% | 0.3 m/s | — |
| 1981 | 23.1°C | 17.8°C | 12.5°C | 28.6°C | 6.1°C | 127 mm | 82% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 23.4°C with lows near 13.3°C (mean 18.4°C), based on 45 years of NASA POWER data.
August averages 97 mm of rainfall in Trois-Rivières, a relatively wet time of year. The wettest on record was 170 mm in 1988.
The hottest August reached 33.6°C in 2025. The coldest dipped to 3.8°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 2.2°C. Daytime highs moved from 22.6°C to 25.1°C and overnight lows from 12.4°C to 14.4°C over the same span.
August is one of the warmer months of the year in Trois-Rivières and a relatively wet time of year, so plan for around 23.4°C daytime highs and 13.3°C at night.
Not quite — August is the 11th coolest month in Trois-Rivières, averaging 18.4°C.
For August in Trois-Rivières, pack light layers you can adjust through the day, with typical highs of 23.4°C and lows of 13.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 81% — quite humid.
Average wind speed in August is 0.3 m/s. The windiest August on record averaged 0.3 m/s (1981).
The wettest August on record was 1988 with 170 mm. On average, August sees 97 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 Trois-Rivières 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.
