August is one of the warmer months of the year in Belleville, with average highs near 24.6°C and lows around 17.6°C (mean 21.1°C). It is about average for rainfall, averaging 64 mm of rainfall and 71% relative humidity across the period.
August is one of the warmer months of the year in Belleville. Across 45 years of records, the warmest August in Belleville was 2021 — when the month averaged 24°C — while the coldest was 1992 at 17.4°C. Typical August days reach 24.6°C with nights near 17.6°C. The long-term trend is warming, about 0.6°C per decade.
August is about average for rainfall in Belleville, averaging 64 mm of rainfall. The wettest August on record was 2000 with 98 mm, while the driest was 2002 at 26 mm.
Relative humidity in Belleville during August averages 71%. The most humid Augusts were 1992 and 2000 at 77%, and the least humid was 2025 at 64%.
August receives about 5.1 kWh/m²/day of solar energy in Belleville. The sunniest August was 2002 at 5.7 kWh/m²/day, and the cloudiest were 1985, 2004 and 2024 at 4.7.
Average wind speed in Belleville during August is 2.2 m/s. The windiest August was 1987 at 2.6 m/s, while the calmest were 1993 and 2003 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.5°C | 19.9°C | 21.2°C | 22.0°C | 22.4°C | +1.9°C |
| Avg High | 24.2°C | 23.6°C | 24.7°C | 25.3°C | 25.9°C | +1.7°C |
| Avg Low | 16.9°C | 16.2°C | 17.7°C | 18.6°C | 18.9°C | +2°C |
| Avg Rain | 71 mm | 66 mm | 62 mm | 58 mm | 64 mm | -8 mm |
August temperatures in Belleville have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 9.1°C (1986) to a record high of 32.7°C (2006).
Rainfall in August is about average for rainfall, averaging 64 mm, with a wettest year of 98 mm.
One of the best times to visit Belleville
August is one of the best times to visit Belleville. Expect days averaging 24.6°C and nights around 17.6°C (mean 21.1°C) — warmer than Belleville'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 | 25.7°C | 22.0°C | 18.3°C | 30.4°C | 11.7°C | 51 mm | 64% | 2.2 m/s | 5.3 |
| 2024 | 25.4°C | 21.8°C | 18.3°C | 29.7°C | 12.5°C | 65 mm | 71% | 2.3 m/s | 4.7 |
| 2023 | 24.5°C | 21.1°C | 17.6°C | 27.1°C | 12.7°C | 76 mm | 71% | 2.2 m/s | 4.8 |
| 2022 | 26.6°C | 23.1°C | 19.6°C | 29.4°C | 15.7°C | 76 mm | 69% | 2.1 m/s | 5.2 |
| 2021 🔥 | 27.3°C | 24.0°C | 20.7°C | 29.9°C | 14.8°C | 33 mm | 71% | 1.9 m/s | 5.1 |
| 2020 | 26.1°C | 22.5°C | 18.9°C | 28.9°C | 13.8°C | 80 mm | 71% | 2.4 m/s | 5.1 |
| 2019 | 25.1°C | 21.7°C | 18.3°C | 28.3°C | 14.7°C | 50 mm | 69% | 2.3 m/s | 5.6 |
| 2018 | 26.4°C | 23.4°C | 20.4°C | 28.7°C | 15.8°C | 66 mm | 74% | 2.2 m/s | 4.8 |
| 2017 | 24.1°C | 20.9°C | 17.6°C | 27.0°C | 12.2°C | 48 mm | 72% | 2.5 m/s | 5.1 |
| 2016 | 27.3°C | 23.8°C | 20.3°C | 31.4°C | 13.8°C | 77 mm | 69% | 2.2 m/s | 5.5 |
| 2015 | 24.6°C | 21.3°C | 18.0°C | 28.2°C | 14.5°C | 74 mm | 71% | 2.3 m/s | 4.9 |
| 2014 | 23.7°C | 20.2°C | 16.7°C | 26.3°C | 12.4°C | 58 mm | 73% | 2.1 m/s | 4.9 |
| 2013 | 24.8°C | 21.3°C | 17.8°C | 28.9°C | 13.7°C | 55 mm | 70% | 2.2 m/s | 5.4 |
| 2012 | 26.1°C | 22.6°C | 19.1°C | 30.5°C | 14.6°C | 32 mm | 67% | 2.4 m/s | 5.3 |
| 2011 | 25.4°C | 22.0°C | 18.7°C | 29.4°C | 14.4°C | 76 mm | 71% | 2.2 m/s | 5 |
| 2010 | 25.5°C | 22.3°C | 19.0°C | 29.3°C | 14.5°C | 47 mm | 71% | 2.4 m/s | 5 |
| 2009 | 24.9°C | 21.6°C | 18.3°C | 29.9°C | 12.4°C | 76 mm | 73% | 2.2 m/s | 5.1 |
| 2008 | 23.8°C | 20.4°C | 17.0°C | 26.3°C | 12.9°C | 88 mm | 73% | 2.2 m/s | 5.4 |
| 2007 | 25.5°C | 21.8°C | 18.1°C | 29.9°C | 12.4°C | 35 mm | 68% | 2.3 m/s | 5.4 |
| 2006 | 25.6°C | 21.9°C | 18.2°C | 32.7°C | 12.7°C | 45 mm | 67% | 2.5 m/s | 5.5 |
| 2005 | 26.6°C | 23.1°C | 19.6°C | 31.2°C | 15.4°C | 81 mm | 68% | 2.3 m/s | 5.2 |
| 2004 | 22.8°C | 19.7°C | 16.7°C | 25.8°C | 12.3°C | 51 mm | 76% | 2 m/s | 4.7 |
| 2003 | 24.3°C | 20.9°C | 17.5°C | 28.7°C | 11.9°C | 64 mm | 75% | 1.8 m/s | 5.1 |
| 2002 | 24.6°C | 20.7°C | 16.7°C | 29.4°C | 12.5°C | 26 mm | 71% | 1.9 m/s | 5.7 |
| 2001 | 25.2°C | 21.4°C | 17.6°C | 31.1°C | 13.4°C | 52 mm | 69% | 2 m/s | 5.3 |
| 2000 🌧️ | 23.5°C | 20.2°C | 16.9°C | 26.2°C | 10.7°C | 98 mm | 77% | 2.2 m/s | 5.1 |
| 1999 | 23.1°C | 19.5°C | 15.9°C | 27.7°C | 11.1°C | 57 mm | 70% | 2.1 m/s | 4.8 |
| 1998 | 25.4°C | 22.1°C | 18.9°C | 28.4°C | 12.5°C | 87 mm | 71% | 2 m/s | 5.2 |
| 1997 | 23.5°C | 19.9°C | 16.4°C | 27.4°C | 13.8°C | 77 mm | 71% | 2.1 m/s | 4.9 |
| 1996 | 23.5°C | 19.6°C | 15.7°C | 27.0°C | 11.5°C | 37 mm | 74% | 1.9 m/s | 5.4 |
| 1995 | 25.1°C | 21.2°C | 17.2°C | 30.4°C | 10.5°C | 68 mm | 71% | 2.1 m/s | 5.4 |
| 1994 | 22.2°C | 18.5°C | 14.8°C | 26.3°C | 10.5°C | 66 mm | 74% | 2 m/s | 5.4 |
| 1993 | 24.4°C | 20.7°C | 16.9°C | 28.7°C | 11.5°C | 41 mm | 73% | 1.8 m/s | 5.2 |
| 1992 ❄️ | 21.0°C | 17.4°C | 13.9°C | 24.9°C | 10.0°C | 97 mm | 77% | 2.3 m/s | 4.9 |
| 1991 | 24.0°C | 20.1°C | 16.2°C | 28.4°C | 12.7°C | 55 mm | 73% | 2.3 m/s | 5.2 |
| 1990 | 23.6°C | 20.0°C | 16.4°C | 27.6°C | 13.5°C | 77 mm | 76% | 2 m/s | 5.3 |
| 1989 | 23.2°C | 19.4°C | 15.6°C | 26.8°C | 10.3°C | 60 mm | 71% | 2.1 m/s | 4.9 |
| 1988 | 24.9°C | 21.2°C | 17.6°C | 30.6°C | 11.1°C | 67 mm | 71% | 2.3 m/s | 4.8 |
| 1987 | 24.2°C | 20.4°C | 16.6°C | 29.8°C | 10.8°C | 61 mm | 66% | 2.6 m/s | 5.2 |
| 1986 | 22.9°C | 19.6°C | 16.3°C | 26.9°C | 9.1°C | 88 mm | 72% | 2.4 m/s | 5 |
| 1985 | 24.2°C | 20.4°C | 16.6°C | 27.9°C | 11.6°C | 61 mm | 69% | 2.3 m/s | 4.7 |
| 1984 | 25.3°C | 21.8°C | 18.2°C | 29.3°C | 11.6°C | 86 mm | 75% | 2 m/s | 5.3 |
| 1983 | 25.9°C | 22.2°C | 18.5°C | 30.3°C | 13.3°C | 82 mm | 69% | 2 m/s | — |
| 1982 | 22.7°C | 19.0°C | 15.2°C | 26.4°C | 9.5°C | 55 mm | 68% | 2.4 m/s | — |
| 1981 | 24.1°C | 20.6°C | 17.1°C | 26.5°C | 12.3°C | 82 mm | 73% | 2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 24.6°C with lows near 17.6°C (mean 21.1°C), based on 45 years of NASA POWER data.
August averages 64 mm of rainfall in Belleville, about average for rainfall. The wettest on record was 98 mm in 2000.
The hottest August reached 32.7°C in 2006. The coldest dipped to 9.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 24.4°C to 25.9°C and overnight lows from 17.1°C to 18.9°C over the same span.
August is one of the warmer months of the year in Belleville and about average for rainfall, so plan for around 24.6°C daytime highs and 17.6°C at night.
Not quite — August is the 11th coolest month in Belleville, averaging 21.1°C.
For August in Belleville, pack light layers you can adjust through the day, with typical highs of 24.6°C and lows of 17.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 71% — moderately humid.
Average wind speed in August is 2.2 m/s. The windiest August on record averaged 2.6 m/s (1987).
The wettest August on record was 2000 with 98 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 Belleville 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.
