August is one of the warmer months of the year in Simcoe, with average highs near 27.3°C and lows around 16.4°C (mean 21.9°C). It is about average for rainfall, averaging 64 mm of rainfall and 67% relative humidity across the period.
August is one of the warmer months of the year in Simcoe. Across 45 years of records, the warmest August in Simcoe was 2021 — when the month averaged 24.9°C — while the coldest was 1992 at 18.2°C. Typical August days reach 27.3°C with nights near 16.4°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in Simcoe, averaging 64 mm of rainfall. The wettest August on record was 2009 with 123 mm, while the driest was 1996 at 21 mm.
Relative humidity in Simcoe during August averages 67%. The most humid August was 2000 at 76%, and the least humid was 2025 at 59%.
August receives about 5.4 kWh/m²/day of solar energy in Simcoe. The sunniest Augusts were 2016 and 2019 at 5.9 kWh/m²/day, and the cloudiest was 1987 at 4.7.
Average wind speed in Simcoe during August is 2.6 m/s. The windiest August was 1987 at 3.3 m/s, while the calmest was 2003 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.3°C | 21.4°C | 21.7°C | 22.3°C | 23.0°C | +1.7°C |
| Avg High | 26.8°C | 27.0°C | 27.1°C | 27.6°C | 28.6°C | +1.8°C |
| Avg Low | 15.8°C | 15.8°C | 16.4°C | 17.0°C | 17.4°C | +1.6°C |
| Avg Rain | 73 mm | 59 mm | 69 mm | 67 mm | 48 mm | -25 mm |
August temperatures in Simcoe have risen by about 1.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4.3°C (1982) to a record high of 35.5°C (2001).
Rainfall in August is about average for rainfall, averaging 64 mm, with a wettest year of 123 mm.
One of the best times to visit Simcoe
August is one of the best times to visit Simcoe. Expect days averaging 27.3°C and nights around 16.4°C (mean 21.9°C) — warmer than Simcoe's yearly average — with moderate rainfall (64 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 | 28.2°C | 22.4°C | 16.7°C | 33.5°C | 8.6°C | 35 mm | 59% | 2.4 m/s | 5.6 |
| 2024 | 28.4°C | 22.8°C | 17.2°C | 33.6°C | 10.5°C | 52 mm | 65% | 2.6 m/s | 5.2 |
| 2023 | 26.9°C | 21.4°C | 15.8°C | 30.1°C | 10.0°C | 74 mm | 67% | 2.9 m/s | 5.1 |
| 2022 | 29.0°C | 23.3°C | 17.6°C | 33.1°C | 12.9°C | 43 mm | 63% | 2.5 m/s | 5.6 |
| 2021 🔥 | 30.3°C | 24.9°C | 19.6°C | 34.0°C | 12.7°C | 40 mm | 65% | 2.4 m/s | 5.5 |
| 2020 | 29.0°C | 23.2°C | 17.5°C | 32.3°C | 12.7°C | 46 mm | 65% | 2.9 m/s | 5.7 |
| 2019 | 27.3°C | 22.0°C | 16.7°C | 30.9°C | 11.5°C | 78 mm | 69% | 2.7 m/s | 5.9 |
| 2018 | 28.1°C | 23.4°C | 18.8°C | 33.1°C | 14.0°C | 87 mm | 73% | 2.8 m/s | 5.1 |
| 2017 | 26.1°C | 20.8°C | 15.5°C | 30.8°C | 10.9°C | 52 mm | 69% | 2.7 m/s | 5.3 |
| 2016 | 30.2°C | 24.7°C | 19.2°C | 34.6°C | 13.7°C | 63 mm | 66% | 2.7 m/s | 5.9 |
| 2015 | 26.4°C | 21.2°C | 16.1°C | 31.1°C | 12.2°C | 54 mm | 69% | 2.7 m/s | 5.7 |
| 2014 | 26.2°C | 20.9°C | 15.5°C | 30.6°C | 11.4°C | 49 mm | 71% | 2.5 m/s | 5.3 |
| 2013 | 26.7°C | 21.3°C | 15.9°C | 30.2°C | 10.4°C | 83 mm | 69% | 2.5 m/s | 5.7 |
| 2012 | 27.4°C | 22.0°C | 16.6°C | 33.1°C | 11.9°C | 78 mm | 66% | 2.4 m/s | 5.6 |
| 2011 | 28.2°C | 22.8°C | 17.5°C | 34.6°C | 12.5°C | 78 mm | 65% | 2.6 m/s | 5.7 |
| 2010 | 29.0°C | 23.5°C | 18.1°C | 33.6°C | 11.3°C | 46 mm | 66% | 2.8 m/s | 5.5 |
| 2009 🌧️ | 25.9°C | 21.2°C | 16.6°C | 31.4°C | 11.0°C | 123 mm | 73% | 2.6 m/s | 5.4 |
| 2008 | 25.8°C | 20.4°C | 15.0°C | 29.9°C | 10.6°C | 82 mm | 70% | 2.5 m/s | 5.8 |
| 2007 | 28.9°C | 23.1°C | 17.4°C | 34.2°C | 10.6°C | 39 mm | 63% | 2.7 m/s | 5 |
| 2006 | 27.4°C | 22.0°C | 16.6°C | 34.2°C | 12.5°C | 57 mm | 66% | 2.8 m/s | 5.3 |
| 2005 | 29.0°C | 23.3°C | 17.5°C | 33.6°C | 12.3°C | 82 mm | 65% | 2.6 m/s | 5.2 |
| 2004 | 24.6°C | 19.8°C | 15.0°C | 28.7°C | 10.6°C | 55 mm | 73% | 2.6 m/s | 5.1 |
| 2003 | 27.4°C | 22.1°C | 16.8°C | 31.7°C | 11.0°C | 56 mm | 71% | 2.1 m/s | 5.5 |
| 2002 | 28.3°C | 22.4°C | 16.5°C | 32.5°C | 12.6°C | 30 mm | 63% | 2.7 m/s | 5.8 |
| 2001 | 28.5°C | 22.7°C | 16.9°C | 35.5°C | 12.0°C | 71 mm | 64% | 2.6 m/s | 5.3 |
| 2000 | 25.0°C | 20.1°C | 15.2°C | 29.7°C | 8.8°C | 91 mm | 76% | 2.7 m/s | 5.4 |
| 1999 | 26.2°C | 20.8°C | 15.4°C | 30.6°C | 10.7°C | 61 mm | 64% | 2.7 m/s | 5 |
| 1998 | 28.5°C | 23.1°C | 17.6°C | 33.0°C | 11.7°C | 43 mm | 63% | 2.4 m/s | 5.4 |
| 1997 | 25.9°C | 20.5°C | 15.1°C | 30.1°C | 10.9°C | 59 mm | 67% | 2.8 m/s | 4.8 |
| 1996 | 28.1°C | 21.9°C | 15.8°C | 32.0°C | 11.9°C | 21 mm | 63% | 2.2 m/s | 5.8 |
| 1995 | 29.5°C | 23.8°C | 18.0°C | 33.3°C | 12.2°C | 48 mm | 63% | 2.7 m/s | 5.4 |
| 1994 | 25.7°C | 20.2°C | 14.6°C | 29.5°C | 9.6°C | 56 mm | 68% | 2.7 m/s | 5.2 |
| 1993 | 28.3°C | 22.6°C | 16.9°C | 33.1°C | 11.6°C | 42 mm | 62% | 2.3 m/s | 5.6 |
| 1992 ❄️ | 23.5°C | 18.2°C | 12.9°C | 28.7°C | 7.9°C | 109 mm | 75% | 3 m/s | 5.6 |
| 1991 | 27.5°C | 21.8°C | 16.1°C | 33.2°C | 10.5°C | 73 mm | 66% | 2.8 m/s | 5.3 |
| 1990 | 26.8°C | 21.3°C | 15.9°C | 30.3°C | 12.3°C | 78 mm | 69% | 2.4 m/s | 4.8 |
| 1989 | 27.2°C | 21.3°C | 15.3°C | 31.4°C | 9.4°C | 38 mm | 65% | 2.9 m/s | 5 |
| 1988 | 27.8°C | 22.4°C | 17.1°C | 33.7°C | 9.4°C | 74 mm | 66% | 2.9 m/s | 5.1 |
| 1987 | 27.1°C | 21.6°C | 16.0°C | 33.4°C | 9.7°C | 59 mm | 62% | 3.3 m/s | 4.7 |
| 1986 | 25.3°C | 20.1°C | 14.9°C | 31.3°C | 6.0°C | 91 mm | 67% | 2.9 m/s | 5.6 |
| 1985 | 26.5°C | 20.9°C | 15.3°C | 32.2°C | 10.4°C | 100 mm | 65% | 2.7 m/s | 5.6 |
| 1984 | 28.2°C | 22.6°C | 17.0°C | 32.5°C | 10.3°C | 49 mm | 67% | 2.6 m/s | 5.8 |
| 1983 | 27.6°C | 22.3°C | 17.0°C | 31.4°C | 11.7°C | 94 mm | 70% | 2.3 m/s | — |
| 1982 | 25.0°C | 19.3°C | 13.7°C | 30.7°C | 4.3°C | 88 mm | 67% | 2.8 m/s | — |
| 1981 | 26.4°C | 21.2°C | 16.0°C | 29.6°C | 8.9°C | 69 mm | 68% | 2.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 27.3°C with lows near 16.4°C (mean 21.9°C), based on 45 years of NASA POWER data.
August averages 64 mm of rainfall in Simcoe, about average for rainfall. The wettest on record was 123 mm in 2009.
The hottest August reached 35.5°C in 2001. The coldest dipped to 4.3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.7°C. Daytime highs moved from 26.7°C to 28.6°C and overnight lows from 15.8°C to 17.4°C over the same span.
August is one of the warmer months of the year in Simcoe and about average for rainfall, so plan for around 27.3°C daytime highs and 16.4°C at night.
Not quite — August is the 11th coolest month in Simcoe, averaging 21.9°C.
For August in Simcoe, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 16.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 67% — moderately humid.
Average wind speed in August is 2.6 m/s. The windiest August on record averaged 3.3 m/s (1987).
The wettest August on record was 2009 with 123 mm. On average, August sees 64 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 Simcoe 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.
