August is one of the warmer months of the year in Rimouski, with average highs near 19.3°C and lows around 12.5°C (mean 15.9°C). It is about average for rainfall, averaging 82 mm of rainfall and 82% relative humidity across the period.
August is one of the warmer months of the year in Rimouski. Across 45 years of records, the warmest August in Rimouski was 2021 — when the month averaged 18.2°C — while the coldest was 1982 at 13°C. Typical August days reach 19.3°C with nights near 12.5°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in Rimouski, averaging 82 mm of rainfall. The wettest August on record was 2004 with 219 mm, while the driest was 1996 at 21 mm.
Relative humidity in Rimouski during August averages 82%. The most humid August was 2011 at 88%, and the least humid was 2025 at 75%.
August receives about 4.7 kWh/m²/day of solar energy in Rimouski. The sunniest August was 1995 at 5.3 kWh/m²/day, and the cloudiest was 2011 at 4.
Average wind speed in Rimouski during August is 1.6 m/s. The windiest Augusts were 1992, 1994 and 2006, among others at 1.9 m/s, while the calmest was 2014 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 15.9°C | 16.0°C | 16.4°C | 16.7°C | +1.7°C |
| Avg High | 18.4°C | 19.5°C | 19.2°C | 19.6°C | 20.3°C | +1.9°C |
| Avg Low | 11.5°C | 12.2°C | 12.7°C | 13.2°C | 13.1°C | +1.6°C |
| Avg Rain | 89 mm | 72 mm | 105 mm | 74 mm | 63 mm | -26 mm |
August temperatures in Rimouski have risen by about 1.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4.7°C (1986) to a record high of 27.9°C (2024).
Rainfall in August is about average for rainfall, averaging 82 mm, with a wettest year of 219 mm.
One of the best times to visit Rimouski
August is one of the best times to visit Rimouski. Expect days averaging 19.3°C and nights around 12.5°C (mean 15.9°C) — warmer than Rimouski's yearly average — with higher rainfall (82 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 | 20.3°C | 16.4°C | 12.4°C | 27.4°C | 7.9°C | 42 mm | 75% | 1.5 m/s | 5.2 |
| 2024 | 21.0°C | 17.3°C | 13.5°C | 27.9°C | 9.1°C | 60 mm | 77% | 1.5 m/s | 4.4 |
| 2023 | 18.8°C | 15.7°C | 12.6°C | 21.9°C | 10.5°C | 94 mm | 83% | 1.6 m/s | 4.1 |
| 2022 | 20.2°C | 16.6°C | 13.0°C | 24.5°C | 8.9°C | 64 mm | 82% | 1.6 m/s | 4.9 |
| 2021 🔥 | 22.0°C | 18.2°C | 14.3°C | 26.9°C | 10.1°C | 29 mm | 79% | 1.6 m/s | 4.8 |
| 2020 | 19.2°C | 16.0°C | 12.7°C | 24.3°C | 7.5°C | 89 mm | 81% | 1.8 m/s | 5.2 |
| 2019 | 19.1°C | 15.7°C | 12.4°C | 23.4°C | 9.3°C | 72 mm | 83% | 1.6 m/s | 4.6 |
| 2018 | 20.4°C | 17.0°C | 13.6°C | 23.3°C | 8.1°C | 69 mm | 85% | 1.6 m/s | 4.7 |
| 2017 | 18.2°C | 15.0°C | 11.7°C | 22.3°C | 8.6°C | 79 mm | 83% | 1.8 m/s | 4.6 |
| 2016 | 19.7°C | 16.5°C | 13.3°C | 23.8°C | 9.3°C | 44 mm | 83% | 1.6 m/s | 4.8 |
| 2015 | 20.2°C | 17.2°C | 14.2°C | 24.9°C | 11.9°C | 116 mm | 86% | 1.6 m/s | 4.4 |
| 2014 | 20.6°C | 17.3°C | 13.9°C | 26.0°C | 8.8°C | 68 mm | 82% | 1.3 m/s | 5 |
| 2013 | 18.2°C | 15.0°C | 11.8°C | 22.4°C | 8.4°C | 67 mm | 86% | 1.6 m/s | 4.3 |
| 2012 | 20.4°C | 17.2°C | 13.9°C | 24.7°C | 10.4°C | 60 mm | 84% | 1.6 m/s | 4.5 |
| 2011 | 19.1°C | 16.3°C | 13.6°C | 23.6°C | 10.9°C | 134 mm | 88% | 1.6 m/s | 4 |
| 2010 | 20.0°C | 16.6°C | 13.2°C | 26.4°C | 10.7°C | 35 mm | 82% | 1.5 m/s | 5.1 |
| 2009 | 19.3°C | 16.1°C | 12.9°C | 24.6°C | 7.7°C | 69 mm | 83% | 1.7 m/s | 4.7 |
| 2008 | 18.9°C | 16.0°C | 13.0°C | 21.6°C | 10.9°C | 123 mm | 86% | 1.7 m/s | 4.3 |
| 2007 | 18.3°C | 15.0°C | 11.6°C | 24.4°C | 7.9°C | 128 mm | 83% | 1.6 m/s | 4.7 |
| 2006 | 18.2°C | 15.1°C | 11.9°C | 22.2°C | 7.9°C | 45 mm | 82% | 1.9 m/s | 4.9 |
| 2005 | 19.5°C | 16.3°C | 13.2°C | 23.0°C | 8.1°C | 142 mm | 84% | 1.7 m/s | 4.6 |
| 2004 🌧️ | 18.6°C | 15.5°C | 12.4°C | 21.6°C | 8.8°C | 219 mm | 86% | 1.7 m/s | 4.6 |
| 2003 | 19.2°C | 16.0°C | 12.8°C | 24.0°C | 6.8°C | 97 mm | 83% | 1.8 m/s | 4.3 |
| 2002 | 20.1°C | 16.7°C | 13.3°C | 26.0°C | 7.3°C | 50 mm | 80% | 1.7 m/s | 5 |
| 2001 | 20.3°C | 16.6°C | 12.8°C | 24.8°C | 8.4°C | 76 mm | 82% | 1.7 m/s | 4.8 |
| 2000 | 19.6°C | 16.4°C | 13.3°C | 23.0°C | 8.7°C | 104 mm | 83% | 1.6 m/s | 4.7 |
| 1999 | 19.5°C | 16.1°C | 12.6°C | 26.0°C | 9.8°C | 51 mm | 78% | 1.6 m/s | 5.1 |
| 1998 | 20.4°C | 16.6°C | 12.8°C | 26.5°C | 9.7°C | 69 mm | 76% | 1.7 m/s | 5.2 |
| 1997 | 18.8°C | 15.3°C | 11.8°C | 26.3°C | 8.1°C | 52 mm | 78% | 1.4 m/s | 4.4 |
| 1996 | 20.1°C | 16.2°C | 12.3°C | 25.7°C | 7.9°C | 21 mm | 78% | 1.5 m/s | 5.2 |
| 1995 | 20.0°C | 16.2°C | 12.3°C | 26.3°C | 7.7°C | 47 mm | 78% | 1.7 m/s | 5.3 |
| 1994 | 18.1°C | 14.6°C | 11.0°C | 22.8°C | 6.9°C | 76 mm | 81% | 1.9 m/s | 5 |
| 1993 | 19.9°C | 16.6°C | 13.2°C | 24.5°C | 8.7°C | 94 mm | 84% | 1.5 m/s | 4.7 |
| 1992 | 18.0°C | 14.6°C | 11.2°C | 22.4°C | 8.4°C | 100 mm | 85% | 1.9 m/s | 4.7 |
| 1991 | 19.5°C | 15.9°C | 12.3°C | 24.5°C | 8.3°C | 123 mm | 83% | 1.8 m/s | 4.5 |
| 1990 | 20.3°C | 16.7°C | 13.0°C | 26.8°C | 7.7°C | 87 mm | 81% | 1.6 m/s | 4.9 |
| 1989 | 18.9°C | 15.4°C | 12.0°C | 22.1°C | 6.3°C | 74 mm | 83% | 1.7 m/s | 4.6 |
| 1988 | 19.0°C | 15.7°C | 12.5°C | 25.1°C | 7.1°C | 111 mm | 83% | 1.7 m/s | 4.1 |
| 1987 | 18.3°C | 14.6°C | 11.0°C | 25.1°C | 6.3°C | 64 mm | 80% | 1.7 m/s | 4.8 |
| 1986 | 17.5°C | 14.1°C | 10.7°C | 21.3°C | 4.7°C | 132 mm | 85% | 1.9 m/s | 4.4 |
| 1985 | 18.9°C | 15.2°C | 11.4°C | 23.2°C | 8.2°C | 40 mm | 81% | 1.4 m/s | 5.1 |
| 1984 | 19.5°C | 16.1°C | 12.8°C | 22.6°C | 9.3°C | 56 mm | 85% | 1.5 m/s | 5 |
| 1983 | 18.8°C | 15.2°C | 11.5°C | 23.6°C | 7.9°C | 62 mm | 83% | 1.6 m/s | — |
| 1982 ❄️ | 16.3°C | 13.0°C | 9.7°C | 22.9°C | 5.0°C | 95 mm | 82% | 1.7 m/s | — |
| 1981 | 18.8°C | 15.5°C | 12.3°C | 22.8°C | 7.8°C | 167 mm | 84% | 1.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 19.3°C with lows near 12.5°C (mean 15.9°C), based on 45 years of NASA POWER data.
August averages 82 mm of rainfall in Rimouski, about average for rainfall. The wettest on record was 219 mm in 2004.
The hottest August reached 27.9°C in 2024. The coldest dipped to 4.7°C in 1986.
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 18.5°C to 20.5°C and overnight lows from 11.5°C to 13.2°C over the same span.
August is one of the warmer months of the year in Rimouski and about average for rainfall, so plan for around 19.3°C daytime highs and 12.5°C at night.
Not quite — August is the 11th coolest month in Rimouski, averaging 15.9°C.
For August in Rimouski, pack light layers you can adjust through the day, with typical highs of 19.3°C and lows of 12.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 82% — quite humid.
Average wind speed in August is 1.6 m/s. The windiest August on record averaged 1.9 m/s (1986).
The wettest August on record was 2004 with 219 mm. On average, August sees 82 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 Rimouski 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.
