August is one of the warmer months of the year in Orillia, with average highs near 25.2°C and lows around 15.5°C (mean 20.4°C). It is about average for rainfall, averaging 55 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Orillia. Across 45 years of records, the warmest August in Orillia was 2016 — when the month averaged 23.7°C — while the coldest was 1982 at 16.5°C. Typical August days reach 25.2°C with nights near 15.5°C. The long-term trend is warming, about 0.8°C per decade.
August is about average for rainfall in Orillia, averaging 55 mm of rainfall. The wettest August on record was 1992 with 127 mm, while the driest was 2021 at 21 mm.
Relative humidity in Orillia during August averages 69%. The most humid August was 1992 at 75%, and the least humid was 1987 at 62%.
August receives about 5.1 kWh/m²/day of solar energy in Orillia. 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 Orillia during August is 1.3 m/s. The windiest Augusts were 2017, 2019 and 2023, among others at 1.5 m/s, while the calmest were 1993, 1996 and 2003, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.1°C | 19.5°C | 20.3°C | 21.3°C | 22.0°C | +2.9°C |
| Avg High | 24.1°C | 24.5°C | 25.1°C | 26.1°C | 27.0°C | +2.9°C |
| Avg Low | 14.1°C | 14.6°C | 15.4°C | 16.6°C | 17.1°C | +3°C |
| Avg Rain | 63 mm | 65 mm | 55 mm | 47 mm | 38 mm | -25 mm |
August temperatures in Orillia have risen by about 3.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4.9°C (1986) to a record high of 34°C (2016).
Rainfall in August is about average for rainfall, averaging 55 mm, with a wettest year of 127 mm.
One of the best times to visit Orillia
August is one of the best times to visit Orillia. Expect days averaging 25.2°C and nights around 15.5°C (mean 20.4°C) — warmer than Orillia's yearly average — with moderate rainfall (55 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 | 26.9°C | 21.8°C | 16.8°C | 33.9°C | 9.3°C | 30 mm | 62% | 1.4 m/s | 5.2 |
| 2024 | 26.8°C | 21.9°C | 16.9°C | 32.6°C | 11.2°C | 38 mm | 66% | 1.4 m/s | 4.9 |
| 2023 | 25.3°C | 20.5°C | 15.7°C | 28.4°C | 10.3°C | 37 mm | 67% | 1.5 m/s | 4.9 |
| 2022 | 27.3°C | 22.2°C | 17.1°C | 31.7°C | 12.8°C | 48 mm | 67% | 1.3 m/s | 5.2 |
| 2021 | 28.5°C | 23.6°C | 18.7°C | 32.1°C | 12.2°C | 21 mm | 66% | 1.2 m/s | 5.2 |
| 2020 | 27.1°C | 22.2°C | 17.3°C | 32.6°C | 12.7°C | 54 mm | 67% | 1.4 m/s | 5.2 |
| 2019 | 25.5°C | 20.8°C | 16.1°C | 29.7°C | 11.9°C | 64 mm | 69% | 1.5 m/s | 5.7 |
| 2018 | 27.7°C | 23.2°C | 18.7°C | 32.9°C | 13.5°C | 55 mm | 69% | 1.4 m/s | 4.9 |
| 2017 | 24.5°C | 20.1°C | 15.6°C | 30.0°C | 10.7°C | 43 mm | 69% | 1.5 m/s | 4.9 |
| 2016 🔥 | 28.9°C | 23.7°C | 18.5°C | 34.0°C | 13.4°C | 32 mm | 65% | 1.4 m/s | 5.6 |
| 2015 | 25.4°C | 20.8°C | 16.3°C | 31.7°C | 12.6°C | 43 mm | 70% | 1.4 m/s | 4.9 |
| 2014 | 24.7°C | 19.8°C | 15.0°C | 30.0°C | 10.3°C | 52 mm | 71% | 1.4 m/s | 5 |
| 2013 | 25.5°C | 20.5°C | 15.6°C | 30.9°C | 11.5°C | 56 mm | 68% | 1.4 m/s | 5.4 |
| 2012 | 26.0°C | 21.4°C | 16.7°C | 31.2°C | 13.2°C | 46 mm | 66% | 1.5 m/s | 5.1 |
| 2011 | 25.7°C | 21.2°C | 16.6°C | 29.4°C | 12.8°C | 54 mm | 68% | 1.3 m/s | 5.1 |
| 2010 | 26.6°C | 21.7°C | 16.9°C | 32.0°C | 11.7°C | 29 mm | 68% | 1.3 m/s | 5 |
| 2009 | 24.7°C | 20.1°C | 15.6°C | 30.3°C | 10.1°C | 60 mm | 70% | 1.3 m/s | 5 |
| 2008 | 24.2°C | 19.5°C | 14.7°C | 28.4°C | 10.2°C | 61 mm | 72% | 1.3 m/s | 5.5 |
| 2007 | 25.7°C | 20.8°C | 15.9°C | 33.2°C | 10.0°C | 36 mm | 66% | 1.3 m/s | 5.2 |
| 2006 | 25.3°C | 20.5°C | 15.7°C | 33.5°C | 9.6°C | 33 mm | 66% | 1.4 m/s | 5.5 |
| 2005 | 26.9°C | 21.9°C | 16.8°C | 32.1°C | 12.0°C | 49 mm | 67% | 1.3 m/s | 5.2 |
| 2004 | 22.7°C | 18.4°C | 14.0°C | 26.7°C | 9.6°C | 75 mm | 74% | 1.3 m/s | 4.9 |
| 2003 | 25.5°C | 20.7°C | 15.9°C | 30.3°C | 10.3°C | 45 mm | 71% | 1.1 m/s | 5.3 |
| 2002 | 25.8°C | 20.4°C | 15.1°C | 32.9°C | 10.8°C | 56 mm | 68% | 1.2 m/s | 5.8 |
| 2001 | 25.9°C | 20.9°C | 15.9°C | 32.0°C | 11.9°C | 66 mm | 68% | 1.2 m/s | 5.5 |
| 2000 | 24.0°C | 19.4°C | 14.8°C | 28.5°C | 7.7°C | 64 mm | 74% | 1.3 m/s | 5.1 |
| 1999 | 23.3°C | 18.8°C | 14.3°C | 28.0°C | 8.8°C | 56 mm | 69% | 1.3 m/s | 5 |
| 1998 | 26.0°C | 21.1°C | 16.3°C | 30.9°C | 9.7°C | 88 mm | 69% | 1.2 m/s | 5.3 |
| 1997 | 23.1°C | 18.4°C | 13.7°C | 28.5°C | 10.5°C | 82 mm | 70% | 1.3 m/s | 4.8 |
| 1996 | 24.4°C | 19.2°C | 14.1°C | 28.1°C | 9.9°C | 43 mm | 72% | 1.1 m/s | 5.5 |
| 1995 | 26.6°C | 21.3°C | 16.0°C | 32.3°C | 8.3°C | 70 mm | 68% | 1.2 m/s | 5.1 |
| 1994 | 23.3°C | 18.2°C | 13.2°C | 27.4°C | 9.9°C | 33 mm | 70% | 1.2 m/s | 5.1 |
| 1993 | 25.8°C | 20.7°C | 15.6°C | 31.1°C | 10.9°C | 71 mm | 68% | 1.1 m/s | 5.3 |
| 1992 🌧️ | 21.8°C | 17.0°C | 12.1°C | 27.7°C | 8.5°C | 127 mm | 75% | 1.3 m/s | 4.7 |
| 1991 | 25.1°C | 20.2°C | 15.3°C | 30.7°C | 10.6°C | 43 mm | 70% | 1.2 m/s | 5.3 |
| 1990 | 25.4°C | 20.3°C | 15.1°C | 29.8°C | 11.2°C | 35 mm | 69% | 1.1 m/s | 4.8 |
| 1989 | 24.6°C | 19.5°C | 14.4°C | 30.2°C | 9.1°C | 51 mm | 67% | 1.2 m/s | 4.7 |
| 1988 | 25.9°C | 20.9°C | 15.9°C | 33.7°C | 9.9°C | 38 mm | 67% | 1.3 m/s | 4.8 |
| 1987 | 24.6°C | 19.5°C | 14.5°C | 31.2°C | 10.6°C | 25 mm | 62% | 1.4 m/s | 5.1 |
| 1986 | 22.7°C | 17.8°C | 13.0°C | 28.4°C | 4.9°C | 46 mm | 67% | 1.2 m/s | 5.3 |
| 1985 | 23.1°C | 18.1°C | 13.1°C | 30.9°C | 7.8°C | 105 mm | 71% | 1.2 m/s | 4.8 |
| 1984 | 25.5°C | 20.3°C | 15.1°C | 30.7°C | 9.0°C | 57 mm | 70% | 1.1 m/s | 5.1 |
| 1983 | 25.2°C | 20.0°C | 14.8°C | 30.0°C | 9.0°C | 61 mm | 70% | 1.1 m/s | — |
| 1982 ❄️ | 21.3°C | 16.5°C | 11.8°C | 27.5°C | 5.2°C | 67 mm | 72% | 1.2 m/s | — |
| 1981 | 24.3°C | 19.5°C | 14.7°C | 28.4°C | 10.5°C | 117 mm | 72% | 1.2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.2°C with lows near 15.5°C (mean 20.4°C), based on 45 years of NASA POWER data.
August averages 55 mm of rainfall in Orillia, about average for rainfall. The wettest on record was 127 mm in 1992.
The hottest August reached 34°C in 2016. The coldest dipped to 4.9°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 3.1°C. Daytime highs moved from 23.9°C to 27°C and overnight lows from 13.9°C to 17°C over the same span.
August is one of the warmer months of the year in Orillia and about average for rainfall, so plan for around 25.2°C daytime highs and 15.5°C at night.
Not quite — August is the 11th coolest month in Orillia, averaging 20.4°C.
For August in Orillia, pack light layers you can adjust through the day, with typical highs of 25.2°C and lows of 15.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 1.3 m/s. The windiest August on record averaged 1.5 m/s (2012).
The wettest August on record was 1992 with 127 mm. On average, August sees 55 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 Orillia 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.
