August is one of the warmer months of the year in Windsor, with average highs near 26.7°C and lows around 16.2°C (mean 21.5°C). It is a relatively wet time of year, averaging 85 mm of rainfall and 73% relative humidity across the period.
August is one of the warmer months of the year in Windsor. Across 45 years of records, the warmest August in Windsor was 2016 — when the month averaged 23.8°C — while the coldest was 1992 at 18.1°C. Typical August days reach 26.7°C with nights near 16.2°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Windsor, averaging 85 mm of rainfall. The wettest August on record was 2007 with 160 mm, while the driest was 1996 at 27 mm.
Relative humidity in Windsor during August averages 73%. The most humid August was 1992 at 79%, and the least humid was 1988 at 66%.
August receives about 5.3 kWh/m²/day of solar energy in Windsor. The sunniest Augusts were 2008 and 2019 at 5.8 kWh/m²/day, and the cloudiest was 1997 at 4.4.
Average wind speed in Windsor during August is 2.4 m/s. The windiest Augusts were 1988, 1992 and 1999, among others at 2.8 m/s, while the calmest was 1996 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.9°C | 20.9°C | 21.7°C | 21.7°C | 22.2°C | +1.3°C |
| Avg High | 26.4°C | 26.1°C | 27.0°C | 26.8°C | 27.4°C | +1°C |
| Avg Low | 15.3°C | 15.7°C | 16.4°C | 16.7°C | 17.0°C | +1.7°C |
| Avg Rain | 87 mm | 83 mm | 77 mm | 85 mm | 103 mm | +16 mm |
August temperatures in Windsor have risen by about 1.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.8°C (1986) to a record high of 36.8°C (1988).
Rainfall in August is a relatively wet time of year, averaging 85 mm, with a wettest year of 160 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Windsor
August is one of the best times to visit Windsor. Expect days averaging 26.7°C and nights around 16.2°C (mean 21.5°C) — warmer than Windsor's yearly average — with higher rainfall (85 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 | 27.7°C | 21.9°C | 16.2°C | 33.9°C | 9.5°C | 48 mm | 67% | 2.4 m/s | 5.5 |
| 2024 | 27.1°C | 22.0°C | 16.8°C | 33.3°C | 10.7°C | 104 mm | 73% | 2.3 m/s | 5.2 |
| 2023 | 25.7°C | 20.5°C | 15.2°C | 29.5°C | 9.1°C | 156 mm | 75% | 2.5 m/s | 5 |
| 2022 | 28.2°C | 22.7°C | 17.2°C | 33.2°C | 12.4°C | 87 mm | 71% | 2.4 m/s | 5.4 |
| 2021 | 28.5°C | 23.7°C | 18.9°C | 31.7°C | 12.9°C | 99 mm | 74% | 2.2 m/s | 5.5 |
| 2020 | 27.4°C | 22.4°C | 17.4°C | 31.8°C | 13.2°C | 122 mm | 73% | 2.4 m/s | 5.6 |
| 2019 | 26.3°C | 21.4°C | 16.5°C | 29.2°C | 12.2°C | 67 mm | 75% | 2.4 m/s | 5.8 |
| 2018 | 27.6°C | 22.9°C | 18.2°C | 31.7°C | 12.8°C | 91 mm | 78% | 2.4 m/s | 5.1 |
| 2017 | 25.5°C | 20.4°C | 15.4°C | 29.7°C | 11.0°C | 90 mm | 75% | 2.4 m/s | 5.2 |
| 2016 🔥 | 28.7°C | 23.8°C | 18.9°C | 34.3°C | 13.5°C | 128 mm | 76% | 2.4 m/s | 5.6 |
| 2015 | 25.9°C | 20.9°C | 15.8°C | 31.0°C | 11.2°C | 82 mm | 75% | 2.6 m/s | 5.4 |
| 2014 | 25.7°C | 20.7°C | 15.8°C | 29.2°C | 8.7°C | 103 mm | 78% | 2.3 m/s | 5.2 |
| 2013 | 25.5°C | 20.5°C | 15.6°C | 30.9°C | 9.5°C | 79 mm | 77% | 2.4 m/s | 5.2 |
| 2012 | 27.3°C | 21.8°C | 16.2°C | 33.8°C | 10.8°C | 92 mm | 68% | 2.3 m/s | 5.7 |
| 2011 | 26.1°C | 21.2°C | 16.4°C | 29.5°C | 11.6°C | 83 mm | 77% | 2.5 m/s | 5.5 |
| 2010 | 29.1°C | 23.6°C | 18.2°C | 33.2°C | 12.1°C | 33 mm | 71% | 2.4 m/s | 5.2 |
| 2009 | 25.2°C | 20.5°C | 15.7°C | 31.0°C | 10.6°C | 106 mm | 78% | 2.7 m/s | 5.2 |
| 2008 | 26.6°C | 21.1°C | 15.6°C | 31.1°C | 10.9°C | 39 mm | 71% | 2.5 m/s | 5.8 |
| 2007 🌧️ | 27.0°C | 22.1°C | 17.2°C | 34.2°C | 10.6°C | 160 mm | 76% | 2.4 m/s | 5.1 |
| 2006 | 27.5°C | 22.2°C | 17.0°C | 34.7°C | 13.1°C | 67 mm | 70% | 2.5 m/s | 5.3 |
| 2005 | 29.3°C | 23.7°C | 18.2°C | 33.8°C | 13.0°C | 38 mm | 67% | 2.6 m/s | 5.2 |
| 2004 | 24.2°C | 19.3°C | 14.5°C | 29.1°C | 9.6°C | 74 mm | 77% | 2.6 m/s | 5.1 |
| 2003 | 28.1°C | 22.5°C | 17.0°C | 33.1°C | 13.1°C | 74 mm | 72% | 2.3 m/s | 5.4 |
| 2002 | 27.9°C | 22.3°C | 16.7°C | 32.3°C | 12.0°C | 43 mm | 70% | 2.5 m/s | 5.6 |
| 2001 | 28.3°C | 22.6°C | 16.9°C | 36.7°C | 12.9°C | 64 mm | 68% | 2.6 m/s | 5.3 |
| 2000 | 25.5°C | 20.6°C | 15.7°C | 30.4°C | 10.4°C | 101 mm | 77% | 2.5 m/s | 5.2 |
| 1999 | 26.2°C | 20.7°C | 15.2°C | 31.9°C | 10.5°C | 55 mm | 68% | 2.8 m/s | 5 |
| 1998 | 27.2°C | 22.3°C | 17.3°C | 31.4°C | 10.7°C | 113 mm | 73% | 2.3 m/s | 5.4 |
| 1997 | 24.1°C | 19.5°C | 14.9°C | 28.8°C | 10.3°C | 87 mm | 78% | 2.7 m/s | 4.4 |
| 1996 | 27.7°C | 21.8°C | 16.0°C | 32.6°C | 12.4°C | 27 mm | 70% | 2.1 m/s | 5.5 |
| 1995 | 28.2°C | 23.4°C | 18.5°C | 32.6°C | 13.5°C | 103 mm | 77% | 2.2 m/s | 5 |
| 1994 | 24.5°C | 19.3°C | 14.1°C | 29.1°C | 10.3°C | 102 mm | 77% | 2.5 m/s | 5.1 |
| 1993 | 26.7°C | 21.7°C | 16.7°C | 31.7°C | 10.7°C | 73 mm | 76% | 2.2 m/s | 5.2 |
| 1992 ❄️ | 23.2°C | 18.1°C | 13.0°C | 29.2°C | 8.2°C | 85 mm | 79% | 2.8 m/s | 5.6 |
| 1991 | 27.0°C | 21.5°C | 15.9°C | 32.5°C | 10.9°C | 97 mm | 71% | 2.3 m/s | 5.4 |
| 1990 | 26.2°C | 20.9°C | 15.6°C | 30.5°C | 11.6°C | 91 mm | 75% | 2.2 m/s | 4.8 |
| 1989 | 25.8°C | 20.5°C | 15.2°C | 29.7°C | 8.0°C | 73 mm | 74% | 2.6 m/s | 5.3 |
| 1988 | 29.3°C | 23.5°C | 17.6°C | 36.8°C | 10.6°C | 87 mm | 66% | 2.8 m/s | 5.4 |
| 1987 | 26.4°C | 21.0°C | 15.6°C | 33.2°C | 7.8°C | 142 mm | 71% | 2.8 m/s | 4.8 |
| 1986 | 24.6°C | 19.1°C | 13.7°C | 30.1°C | 5.8°C | 83 mm | 72% | 2.5 m/s | 5.1 |
| 1985 | 24.6°C | 19.3°C | 14.0°C | 30.0°C | 9.7°C | 133 mm | 76% | 2.4 m/s | 5 |
| 1984 | 27.8°C | 21.9°C | 16.0°C | 31.3°C | 10.0°C | 76 mm | 71% | 2.4 m/s | 5.4 |
| 1983 | 27.8°C | 22.1°C | 16.4°C | 32.5°C | 11.4°C | 47 mm | 74% | 2.2 m/s | — |
| 1982 | 25.2°C | 19.3°C | 13.4°C | 28.9°C | 6.2°C | 44 mm | 71% | 2.4 m/s | — |
| 1981 | 26.3°C | 21.0°C | 15.6°C | 30.6°C | 9.7°C | 94 mm | 73% | 2.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 26.7°C with lows near 16.2°C (mean 21.5°C), based on 45 years of NASA POWER data.
August averages 85 mm of rainfall in Windsor, a relatively wet time of year. The wettest on record was 160 mm in 2007.
The hottest August reached 36.8°C in 1988. The coldest dipped to 5.8°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.5°C. Daytime highs moved from 26.3°C to 27.4°C and overnight lows from 15.1°C to 16.9°C over the same span.
August is one of the warmer months of the year in Windsor and a relatively wet time of year, so plan for around 26.7°C daytime highs and 16.2°C at night.
Not quite — August is the 11th coolest month in Windsor, averaging 21.5°C.
For August in Windsor, pack light layers you can adjust through the day, with typical highs of 26.7°C and lows of 16.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 2.4 m/s. The windiest August on record averaged 2.8 m/s (1987).
The wettest August on record was 2007 with 160 mm. On average, August sees 85 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 Windsor 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.
