August is one of the warmer months of the year in Sudbury, with average highs near 24.4°C and lows around 12.6°C (mean 18.5°C). It is a relatively wet time of year, averaging 76 mm of rainfall and 73% relative humidity across the period.
August is one of the warmer months of the year in Sudbury. Across 45 years of records, the warmest August in Sudbury was 2021 — when the month averaged 21.3°C — while the coldest was 2004 at 16.1°C. Typical August days reach 24.4°C with nights near 12.6°C. The long-term trend is warming, about 0.2°C per decade.
August is a relatively wet time of year in Sudbury, averaging 76 mm of rainfall. The wettest August on record was 1988 with 156 mm, while the driest was 1990 at 39 mm.
Relative humidity in Sudbury during August averages 73%. The most humid August was 2017 at 81%, and the least humid was 2012 at 67%.
August receives about 4.9 kWh/m²/day of solar energy in Sudbury. The sunniest August was 2002 at 5.6 kWh/m²/day, and the cloudiest was 2015 at 4.3.
Average wind speed in Sudbury during August is 0.6 m/s. The windiest Augusts were 2022, 2023 and 2025, among others at 0.6 m/s, while the calmest were 2017, 2020 and 2024, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 18.5°C | 18.1°C | 18.9°C | 19.3°C | +1.3°C |
| Avg High | 23.9°C | 24.6°C | 23.9°C | 24.5°C | 25.3°C | +1.4°C |
| Avg Low | 12.1°C | 12.4°C | 12.3°C | 13.2°C | 13.4°C | +1.3°C |
| Avg Rain | 83 mm | 66 mm | 74 mm | 88 mm | 66 mm | -16 mm |
August temperatures in Sudbury have risen by about 1.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 1.9°C (1982) to a record high of 33.8°C (2005).
Rainfall in August is a relatively wet time of year, averaging 76 mm, with a wettest year of 156 mm.
One of the best times to visit Sudbury
August is one of the best times to visit Sudbury. Expect days averaging 24.4°C and nights around 12.6°C (mean 18.5°C) — warmer than Sudbury's yearly average — with moderate rainfall (76 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 | 24.6°C | 18.9°C | 13.2°C | 30.7°C | 5.4°C | 66 mm | 73% | 0.6 m/s | 5.1 |
| 2024 | 26.1°C | 19.7°C | 13.3°C | 33.5°C | 6.6°C | 53 mm | 68% | 0.5 m/s | 5.2 |
| 2023 | 23.7°C | 17.6°C | 11.5°C | 29.5°C | 6.2°C | 76 mm | 73% | 0.6 m/s | 4.6 |
| 2022 | 25.7°C | 19.8°C | 13.8°C | 29.5°C | 8.9°C | 62 mm | 68% | 0.6 m/s | 5 |
| 2021 🔥 | 27.1°C | 21.3°C | 15.4°C | 33.4°C | 9.4°C | 56 mm | 73% | 0.6 m/s | 4.9 |
| 2020 | 24.3°C | 18.7°C | 13.0°C | 31.0°C | 6.7°C | 85 mm | 75% | 0.5 m/s | 4.6 |
| 2019 | 23.7°C | 17.8°C | 11.9°C | 27.0°C | 7.6°C | 82 mm | 75% | 0.6 m/s | 5.5 |
| 2018 | 26.3°C | 20.5°C | 14.8°C | 30.8°C | 7.8°C | 91 mm | 73% | 0.6 m/s | 4.7 |
| 2017 | 21.6°C | 16.7°C | 11.7°C | 27.0°C | 5.2°C | 102 mm | 81% | 0.5 m/s | 4.5 |
| 2016 | 26.3°C | 20.7°C | 15.2°C | 31.4°C | 9.3°C | 100 mm | 74% | 0.6 m/s | 4.9 |
| 2015 | 23.5°C | 18.3°C | 13.1°C | 29.5°C | 9.8°C | 68 mm | 79% | 0.5 m/s | 4.3 |
| 2014 | 22.6°C | 17.4°C | 12.2°C | 27.6°C | 7.4°C | 142 mm | 78% | 0.5 m/s | 4.4 |
| 2013 | 24.6°C | 18.6°C | 12.5°C | 31.5°C | 8.1°C | 65 mm | 73% | 0.6 m/s | 4.8 |
| 2012 | 25.4°C | 19.2°C | 13.0°C | 32.0°C | 5.7°C | 61 mm | 67% | 0.6 m/s | 5 |
| 2011 | 25.6°C | 19.5°C | 13.3°C | 30.6°C | 8.6°C | 63 mm | 69% | 0.6 m/s | 5.1 |
| 2010 | 25.8°C | 20.1°C | 14.4°C | 32.5°C | 7.7°C | 105 mm | 72% | 0.6 m/s | 4.7 |
| 2009 | 22.2°C | 16.9°C | 11.6°C | 27.7°C | 4.0°C | 93 mm | 80% | 0.6 m/s | 4.6 |
| 2008 | 23.1°C | 17.5°C | 12.0°C | 26.7°C | 6.9°C | 116 mm | 77% | 0.5 m/s | 5.2 |
| 2007 | 25.4°C | 19.1°C | 12.9°C | 32.8°C | 7.3°C | 62 mm | 67% | 0.6 m/s | 5.2 |
| 2006 | 23.9°C | 17.7°C | 11.6°C | 33.5°C | 5.6°C | 65 mm | 70% | 0.6 m/s | 5.4 |
| 2005 | 25.7°C | 19.5°C | 13.4°C | 33.8°C | 8.7°C | 76 mm | 69% | 0.6 m/s | 5.1 |
| 2004 ❄️ | 21.7°C | 16.1°C | 10.5°C | 26.9°C | 4.4°C | 43 mm | 76% | 0.6 m/s | 4.7 |
| 2003 | 24.4°C | 18.7°C | 13.0°C | 29.2°C | 6.5°C | 78 mm | 76% | 0.6 m/s | 5 |
| 2002 | 24.2°C | 18.3°C | 12.3°C | 28.9°C | 7.3°C | 49 mm | 75% | 0.6 m/s | 5.6 |
| 2001 | 25.2°C | 19.5°C | 13.7°C | 33.4°C | 7.5°C | 85 mm | 73% | 0.6 m/s | 5.1 |
| 2000 | 23.5°C | 17.6°C | 11.6°C | 27.7°C | 5.3°C | 70 mm | 74% | 0.6 m/s | 4.7 |
| 1999 | 23.4°C | 17.5°C | 11.6°C | 29.2°C | 5.9°C | 76 mm | 70% | 0.6 m/s | 5.1 |
| 1998 | 26.0°C | 19.9°C | 13.7°C | 30.1°C | 6.5°C | 52 mm | 69% | 0.6 m/s | 5 |
| 1997 | 22.4°C | 16.6°C | 10.8°C | 27.4°C | 6.6°C | 95 mm | 74% | 0.6 m/s | 4.6 |
| 1996 | 25.0°C | 18.7°C | 12.5°C | 27.9°C | 6.7°C | 47 mm | 72% | 0.6 m/s | 5.4 |
| 1995 | 26.1°C | 19.9°C | 13.6°C | 33.6°C | 6.1°C | 64 mm | 71% | 0.6 m/s | 4.7 |
| 1994 | 23.0°C | 16.9°C | 10.8°C | 28.0°C | 6.0°C | 93 mm | 74% | 0.6 m/s | 4.9 |
| 1993 | 26.6°C | 20.3°C | 14.1°C | 33.6°C | 6.9°C | 75 mm | 70% | 0.5 m/s | 5.2 |
| 1992 | 22.6°C | 16.6°C | 10.7°C | 29.2°C | 6.1°C | 78 mm | 71% | 0.6 m/s | 4.7 |
| 1991 | 26.0°C | 19.6°C | 13.3°C | 33.3°C | 8.2°C | 43 mm | 69% | 0.6 m/s | 5.4 |
| 1990 | 24.8°C | 18.6°C | 12.4°C | 31.8°C | 7.0°C | 39 mm | 71% | 0.6 m/s | 5 |
| 1989 | 23.6°C | 17.6°C | 11.6°C | 29.2°C | 4.6°C | 78 mm | 74% | 0.5 m/s | 4.6 |
| 1988 🌧️ | 24.8°C | 19.1°C | 13.4°C | 33.3°C | 6.3°C | 156 mm | 77% | 0.6 m/s | 4.7 |
| 1987 | 24.5°C | 18.1°C | 11.7°C | 32.7°C | 5.3°C | 73 mm | 68% | 0.6 m/s | 5 |
| 1986 | 22.5°C | 16.6°C | 10.7°C | 28.8°C | 4.0°C | 51 mm | 71% | 0.6 m/s | 5.1 |
| 1985 | 22.3°C | 16.8°C | 11.3°C | 27.8°C | 7.6°C | 53 mm | 77% | 0.5 m/s | 5 |
| 1984 | 24.8°C | 19.1°C | 13.3°C | 30.0°C | 6.7°C | 100 mm | 76% | 0.5 m/s | 5.3 |
| 1983 | 25.5°C | 19.9°C | 14.3°C | 30.5°C | 9.0°C | 80 mm | 75% | 0.5 m/s | — |
| 1982 | 22.2°C | 16.2°C | 10.1°C | 28.6°C | 1.9°C | 73 mm | 71% | 0.6 m/s | — |
| 1981 | 25.0°C | 18.9°C | 12.8°C | 28.5°C | 6.6°C | 82 mm | 70% | 0.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 24.4°C with lows near 12.6°C (mean 18.5°C), based on 45 years of NASA POWER data.
August averages 76 mm of rainfall in Sudbury, a relatively wet time of year. The wettest on record was 156 mm in 1988.
The hottest August reached 33.8°C in 2005. The coldest dipped to 1.9°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.3°C. Daytime highs moved from 24°C to 25.4°C and overnight lows from 12.4°C to 13.4°C over the same span.
August is one of the warmer months of the year in Sudbury and a relatively wet time of year, so plan for around 24.4°C daytime highs and 12.6°C at night.
Not quite — August is the 11th coolest month in Sudbury, averaging 18.5°C.
For August in Sudbury, pack light layers you can adjust through the day, with typical highs of 24.4°C and lows of 12.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 0.6 m/s. The windiest August on record averaged 0.6 m/s (1982).
The wettest August on record was 1988 with 156 mm. On average, August sees 76 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 Sudbury 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.
