August is one of the warmer months of the year in Gravenhurst, with average highs near 25.6°C and lows around 14.2°C (mean 19.9°C). It is about average for rainfall, averaging 52 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Gravenhurst. Across 45 years of records, the warmest August in Gravenhurst was 2021 — when the month averaged 23.3°C — while the coldest was 1982 at 15.6°C. Typical August days reach 25.6°C with nights near 14.2°C. The long-term trend is warming, about 0.7°C per decade.
August is about average for rainfall in Gravenhurst, averaging 52 mm of rainfall. The wettest August on record was 1981 with 126 mm, while the driest was 1990 at 18 mm.
Relative humidity in Gravenhurst during August averages 69%. The most humid August was 2004 at 77%, and the least humid was 2025 at 60%.
August receives about 5.1 kWh/m²/day of solar energy in Gravenhurst. The sunniest August was 2002 at 5.8 kWh/m²/day, and the cloudiest were 1989 and 1992 at 4.7.
Average wind speed in Gravenhurst during August is 0.4 m/s. The windiest Augusts were 2017, 2019 and 2020, among others at 0.5 m/s, while the calmest were 1983 and 1984 at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.7°C | 19.3°C | 19.7°C | 20.8°C | 21.6°C | +2.9°C |
| Avg High | 24.3°C | 25.0°C | 25.2°C | 26.5°C | 27.6°C | +3.3°C |
| Avg Low | 13.1°C | 13.5°C | 14.2°C | 15.1°C | 15.6°C | +2.5°C |
| Avg Rain | 63 mm | 60 mm | 57 mm | 43 mm | 30 mm | -32 mm |
August temperatures in Gravenhurst have risen by about 3.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.2°C (1982) to a record high of 35.5°C (2025).
Rainfall in August is about average for rainfall, averaging 52 mm, with a wettest year of 126 mm.
One of the best times to visit Gravenhurst
August is one of the best times to visit Gravenhurst. Expect days averaging 25.6°C and nights around 14.2°C (mean 19.9°C) — warmer than Gravenhurst's yearly average — with moderate rainfall (52 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 | 27.4°C | 21.3°C | 15.2°C | 35.5°C | 6.6°C | 22 mm | 60% | 0.4 m/s | 5.2 |
| 2024 | 27.7°C | 21.6°C | 15.6°C | 33.5°C | 9.3°C | 33 mm | 63% | 0.4 m/s | 4.9 |
| 2023 | 26.0°C | 20.2°C | 14.3°C | 29.7°C | 8.2°C | 29 mm | 65% | 0.4 m/s | 4.9 |
| 2022 | 28.0°C | 21.8°C | 15.6°C | 32.8°C | 10.5°C | 35 mm | 65% | 0.4 m/s | 5.2 |
| 2021 🔥 | 29.3°C | 23.3°C | 17.3°C | 34.1°C | 9.8°C | 19 mm | 64% | 0.4 m/s | 5.2 |
| 2020 | 27.2°C | 21.3°C | 15.5°C | 33.2°C | 9.1°C | 45 mm | 67% | 0.5 m/s | 5.2 |
| 2019 | 25.2°C | 19.8°C | 14.4°C | 29.7°C | 9.9°C | 92 mm | 70% | 0.5 m/s | 5.7 |
| 2018 | 28.4°C | 22.8°C | 17.2°C | 33.3°C | 11.5°C | 36 mm | 68% | 0.4 m/s | 4.9 |
| 2017 | 24.9°C | 19.6°C | 14.2°C | 30.6°C | 9.7°C | 32 mm | 68% | 0.5 m/s | 4.9 |
| 2016 | 28.9°C | 22.9°C | 16.9°C | 35.2°C | 10.7°C | 32 mm | 65% | 0.4 m/s | 5.6 |
| 2015 | 25.7°C | 20.2°C | 14.7°C | 31.7°C | 10.7°C | 33 mm | 70% | 0.5 m/s | 4.9 |
| 2014 | 25.6°C | 19.5°C | 13.5°C | 31.3°C | 8.9°C | 53 mm | 69% | 0.4 m/s | 5 |
| 2013 | 26.1°C | 20.2°C | 14.3°C | 32.7°C | 10.5°C | 45 mm | 67% | 0.5 m/s | 5.4 |
| 2012 | 26.4°C | 20.8°C | 15.3°C | 33.1°C | 10.7°C | 41 mm | 64% | 0.5 m/s | 5.1 |
| 2011 | 26.4°C | 20.8°C | 15.2°C | 31.3°C | 10.8°C | 38 mm | 67% | 0.4 m/s | 5.1 |
| 2010 | 27.1°C | 21.4°C | 15.7°C | 32.2°C | 10.8°C | 22 mm | 67% | 0.4 m/s | 5 |
| 2009 | 25.2°C | 19.7°C | 14.1°C | 31.2°C | 6.5°C | 37 mm | 69% | 0.4 m/s | 5 |
| 2008 | 25.4°C | 19.6°C | 13.7°C | 30.9°C | 8.8°C | 35 mm | 69% | 0.4 m/s | 5.5 |
| 2007 | 26.3°C | 20.5°C | 14.6°C | 32.6°C | 8.2°C | 31 mm | 65% | 0.4 m/s | 5.2 |
| 2006 | 25.6°C | 20.0°C | 14.3°C | 33.4°C | 7.9°C | 27 mm | 65% | 0.5 m/s | 5.5 |
| 2005 | 27.3°C | 21.3°C | 15.4°C | 32.1°C | 10.3°C | 38 mm | 67% | 0.4 m/s | 5.2 |
| 2004 | 22.1°C | 17.4°C | 12.6°C | 26.8°C | 8.0°C | 98 mm | 77% | 0.4 m/s | 4.9 |
| 2003 | 25.9°C | 20.5°C | 15.1°C | 31.5°C | 8.9°C | 52 mm | 72% | 0.4 m/s | 5.3 |
| 2002 | 24.9°C | 19.4°C | 14.0°C | 30.6°C | 9.7°C | 93 mm | 75% | 0.4 m/s | 5.8 |
| 2001 | 25.9°C | 20.5°C | 15.0°C | 31.4°C | 10.8°C | 83 mm | 72% | 0.4 m/s | 5.5 |
| 2000 | 23.6°C | 18.4°C | 13.3°C | 29.0°C | 5.6°C | 78 mm | 77% | 0.4 m/s | 5.1 |
| 1999 | 24.0°C | 18.6°C | 13.2°C | 29.1°C | 7.6°C | 64 mm | 70% | 0.4 m/s | 5 |
| 1998 | 26.2°C | 20.4°C | 14.6°C | 31.2°C | 7.8°C | 77 mm | 70% | 0.4 m/s | 5.3 |
| 1997 | 23.4°C | 17.9°C | 12.4°C | 29.1°C | 8.9°C | 69 mm | 71% | 0.4 m/s | 4.8 |
| 1996 | 25.0°C | 19.3°C | 13.6°C | 29.1°C | 8.7°C | 47 mm | 72% | 0.4 m/s | 5.5 |
| 1995 | 27.7°C | 21.5°C | 15.3°C | 33.8°C | 7.4°C | 51 mm | 65% | 0.4 m/s | 5.1 |
| 1994 | 23.6°C | 17.9°C | 12.2°C | 28.3°C | 8.6°C | 38 mm | 71% | 0.4 m/s | 5.1 |
| 1993 | 26.4°C | 20.5°C | 14.7°C | 31.7°C | 9.2°C | 91 mm | 70% | 0.4 m/s | 5.3 |
| 1992 | 22.2°C | 16.7°C | 11.2°C | 29.3°C | 6.5°C | 113 mm | 74% | 0.4 m/s | 4.7 |
| 1991 | 25.4°C | 19.9°C | 14.3°C | 31.5°C | 9.8°C | 36 mm | 72% | 0.4 m/s | 5.3 |
| 1990 | 25.9°C | 19.9°C | 13.8°C | 30.4°C | 10.3°C | 18 mm | 70% | 0.4 m/s | 4.8 |
| 1989 | 25.4°C | 19.5°C | 13.6°C | 29.5°C | 7.5°C | 55 mm | 66% | 0.4 m/s | 4.7 |
| 1988 | 26.3°C | 20.7°C | 15.0°C | 34.0°C | 8.5°C | 62 mm | 69% | 0.4 m/s | 4.8 |
| 1987 | 25.4°C | 19.6°C | 13.8°C | 31.2°C | 7.6°C | 25 mm | 61% | 0.4 m/s | 5.1 |
| 1986 | 23.2°C | 17.5°C | 11.7°C | 29.1°C | 3.8°C | 38 mm | 68% | 0.4 m/s | 5.3 |
| 1985 | 22.4°C | 17.2°C | 12.0°C | 29.5°C | 6.1°C | 93 mm | 76% | 0.4 m/s | 4.8 |
| 1984 | 25.1°C | 19.5°C | 13.9°C | 29.9°C | 7.1°C | 62 mm | 74% | 0.3 m/s | 5.1 |
| 1983 | 25.4°C | 19.6°C | 13.7°C | 30.0°C | 7.8°C | 50 mm | 73% | 0.3 m/s | — |
| 1982 ❄️ | 20.7°C | 15.6°C | 10.5°C | 25.9°C | 3.2°C | 54 mm | 76% | 0.4 m/s | — |
| 1981 🌧️ | 24.4°C | 19.0°C | 13.6°C | 28.4°C | 8.6°C | 126 mm | 74% | 0.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.6°C with lows near 14.2°C (mean 19.9°C), based on 45 years of NASA POWER data.
August averages 52 mm of rainfall in Gravenhurst, about average for rainfall. The wettest on record was 126 mm in 1981.
The hottest August reached 35.5°C in 2025. The coldest dipped to 3.2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 3.4°C. Daytime highs moved from 23.6°C to 27.7°C and overnight lows from 12.7°C to 15.6°C over the same span.
August is one of the warmer months of the year in Gravenhurst and about average for rainfall, so plan for around 25.6°C daytime highs and 14.2°C at night.
Not quite — August is the 11th coolest month in Gravenhurst, averaging 19.9°C.
For August in Gravenhurst, pack light layers you can adjust through the day, with typical highs of 25.6°C and lows of 14.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 0.4 m/s. The windiest August on record averaged 0.5 m/s (2006).
The wettest August on record was 1981 with 126 mm. On average, August sees 52 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 Gravenhurst 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.
