August is one of the warmer months of the year in Belleville, with average highs near 31.1°C and lows around 19.2°C (mean 25.2°C). It is about average for rainfall, averaging 85 mm of rainfall and 70% 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 2007 — when the month averaged 29.1°C — while the coldest was 2004 at 22.3°C. Typical August days reach 31.1°C with nights near 19.2°C. The long-term August temperature trend is broadly flat.
August is about average for rainfall in Belleville, averaging 85 mm of rainfall. The wettest August on record was 2016 with 180 mm, while the driest was 2025 at 17 mm.
Relative humidity in Belleville during August averages 70%. The most humid August was 2016 at 83%, and the least humid was 2012 at 55%.
August receives about 5.7 kWh/m²/day of solar energy in Belleville. The sunniest August was 2010 at 6.4 kWh/m²/day, and the cloudiest was 1985 at 4.8.
Average wind speed in Belleville during August is 1.6 m/s. The windiest Augusts were 1987 and 2002 at 1.8 m/s, while the calmest were 1995, 2013 and 2016 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.3°C | 24.9°C | 25.7°C | 24.9°C | 25.0°C | -0.3°C |
| Avg High | 31.6°C | 31.0°C | 31.8°C | 30.4°C | 30.8°C | -0.8°C |
| Avg Low | 18.9°C | 18.8°C | 19.6°C | 19.4°C | 19.2°C | +0.3°C |
| Avg Rain | 87 mm | 74 mm | 82 mm | 104 mm | 74 mm | -12 mm |
August temperatures in Belleville have risen by about 0.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 8.1°C (1986) to a record high of 41.2°C (1984).
Rainfall in August is about average for rainfall, averaging 85 mm, with a wettest year of 180 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
One of the best times to visit Belleville
August is one of the best times to visit Belleville. Expect days averaging 31.1°C and nights around 19.2°C (mean 25.2°C) — warmer than Belleville'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 | 31.6°C | 25.1°C | 18.6°C | 37.2°C | 11.7°C | 17 mm | 64% | 1.5 m/s | 6.1 |
| 2024 | 31.3°C | 25.0°C | 18.8°C | 38.6°C | 10.8°C | 36 mm | 66% | 1.6 m/s | 5.7 |
| 2023 | 31.7°C | 25.6°C | 19.5°C | 39.7°C | 11.5°C | 123 mm | 72% | 1.7 m/s | 5.4 |
| 2022 | 31.0°C | 25.2°C | 19.5°C | 35.3°C | 15.4°C | 89 mm | 72% | 1.6 m/s | 6.1 |
| 2021 | 30.8°C | 25.7°C | 20.5°C | 35.1°C | 14.8°C | 92 mm | 76% | 1.5 m/s | 5.9 |
| 2020 | 28.5°C | 23.3°C | 18.2°C | 33.6°C | 13.7°C | 89 mm | 79% | 1.4 m/s | 5.8 |
| 2019 | 29.1°C | 24.2°C | 19.4°C | 32.8°C | 15.5°C | 136 mm | 81% | 1.5 m/s | 5.5 |
| 2018 | 30.0°C | 25.0°C | 19.9°C | 35.5°C | 14.5°C | 134 mm | 76% | 1.7 m/s | 5.4 |
| 2017 | 30.6°C | 24.0°C | 17.4°C | 34.4°C | 13.2°C | 61 mm | 64% | 1.5 m/s | 5.7 |
| 2016 🌧️ | 29.3°C | 25.2°C | 21.1°C | 33.7°C | 15.8°C | 180 mm | 83% | 1.3 m/s | 5.2 |
| 2015 | 28.0°C | 22.8°C | 17.7°C | 31.5°C | 11.1°C | 103 mm | 80% | 1.5 m/s | 5.8 |
| 2014 | 31.2°C | 25.8°C | 20.3°C | 36.6°C | 13.8°C | 145 mm | 73% | 1.5 m/s | 5.3 |
| 2013 | 29.0°C | 23.8°C | 18.6°C | 36.9°C | 11.5°C | 35 mm | 77% | 1.3 m/s | 5.6 |
| 2012 | 33.4°C | 26.0°C | 18.6°C | 39.6°C | 13.6°C | 122 mm | 55% | 1.7 m/s | 6 |
| 2011 | 31.4°C | 25.7°C | 20.0°C | 38.0°C | 15.2°C | 37 mm | 71% | 1.5 m/s | 6 |
| 2010 | 32.1°C | 26.3°C | 20.5°C | 37.3°C | 13.3°C | 89 mm | 73% | 1.6 m/s | 6.4 |
| 2009 | 28.6°C | 23.2°C | 17.8°C | 33.5°C | 10.5°C | 83 mm | 78% | 1.7 m/s | 5.8 |
| 2008 | 28.3°C | 23.1°C | 17.9°C | 34.5°C | 13.0°C | 57 mm | 78% | 1.4 m/s | 6 |
| 2007 🔥 | 35.8°C | 29.1°C | 22.3°C | 40.6°C | 15.0°C | 38 mm | 59% | 1.7 m/s | 6.1 |
| 2006 | 32.8°C | 26.6°C | 20.4°C | 38.9°C | 15.4°C | 78 mm | 65% | 1.7 m/s | 5.4 |
| 2005 | 32.9°C | 27.1°C | 21.2°C | 38.1°C | 15.9°C | 104 mm | 66% | 1.5 m/s | 5.5 |
| 2004 ❄️ | 28.1°C | 22.3°C | 16.5°C | 34.6°C | 9.6°C | 110 mm | 73% | 1.7 m/s | 5.6 |
| 2003 | 33.1°C | 26.6°C | 20.1°C | 39.1°C | 16.5°C | 83 mm | 65% | 1.7 m/s | 5.7 |
| 2002 | 32.3°C | 26.2°C | 20.1°C | 37.8°C | 13.8°C | 89 mm | 69% | 1.8 m/s | 5.4 |
| 2001 | 33.6°C | 26.7°C | 19.7°C | 38.4°C | 15.5°C | 82 mm | 61% | 1.6 m/s | 5.9 |
| 2000 | 32.4°C | 26.2°C | 19.9°C | 38.8°C | 15.4°C | 98 mm | 69% | 1.6 m/s | 5.7 |
| 1999 | 32.6°C | 25.3°C | 18.0°C | 38.6°C | 13.7°C | 57 mm | 57% | 1.7 m/s | 5.9 |
| 1998 | 30.0°C | 24.5°C | 19.0°C | 35.6°C | 14.8°C | 86 mm | 76% | 1.4 m/s | 5.6 |
| 1997 | 30.8°C | 24.7°C | 18.5°C | 35.7°C | 12.6°C | 107 mm | 69% | 1.7 m/s | 5.2 |
| 1996 | 32.1°C | 25.6°C | 19.1°C | 35.6°C | 15.5°C | 49 mm | 64% | 1.4 m/s | 5.8 |
| 1995 | 31.5°C | 26.4°C | 21.3°C | 34.5°C | 15.9°C | 87 mm | 77% | 1.3 m/s | 6 |
| 1994 | 29.8°C | 23.4°C | 17.0°C | 35.2°C | 10.3°C | 71 mm | 71% | 1.6 m/s | 5.8 |
| 1993 | 29.5°C | 24.8°C | 20.2°C | 33.0°C | 13.1°C | 102 mm | 82% | 1.4 m/s | 5.5 |
| 1992 | 29.8°C | 23.2°C | 16.6°C | 36.2°C | 11.3°C | 48 mm | 64% | 1.7 m/s | 5.5 |
| 1991 | 32.4°C | 26.0°C | 19.7°C | 38.9°C | 14.1°C | 70 mm | 64% | 1.6 m/s | 5.8 |
| 1990 | 31.1°C | 24.7°C | 18.3°C | 38.5°C | 11.1°C | 67 mm | 69% | 1.5 m/s | 5.5 |
| 1989 | 31.9°C | 25.8°C | 19.7°C | 38.3°C | 12.9°C | 81 mm | 66% | 1.6 m/s | 5.5 |
| 1988 | 35.0°C | 28.1°C | 21.1°C | 40.9°C | 11.4°C | 47 mm | 57% | 1.6 m/s | 5.7 |
| 1987 | 32.7°C | 26.1°C | 19.4°C | 40.0°C | 13.2°C | 107 mm | 62% | 1.8 m/s | 5.6 |
| 1986 | 30.1°C | 23.2°C | 16.3°C | 35.8°C | 8.1°C | 74 mm | 62% | 1.7 m/s | 5.8 |
| 1985 | 27.7°C | 22.6°C | 17.6°C | 31.8°C | 12.7°C | 132 mm | 81% | 1.6 m/s | 4.8 |
| 1984 | 32.4°C | 25.6°C | 18.7°C | 41.2°C | 12.9°C | 63 mm | 63% | 1.6 m/s | 5.5 |
| 1983 | 35.1°C | 28.3°C | 21.5°C | 39.5°C | 15.5°C | 43 mm | 61% | 1.4 m/s | — |
| 1982 | 29.7°C | 23.9°C | 18.0°C | 36.9°C | 12.1°C | 119 mm | 73% | 1.6 m/s | — |
| 1981 | 29.6°C | 23.7°C | 17.9°C | 33.5°C | 12.5°C | 115 mm | 74% | 1.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 31.1°C with lows near 19.2°C (mean 25.2°C), based on 45 years of NASA POWER data.
August averages 85 mm of rainfall in Belleville, about average for rainfall. The wettest on record was 180 mm in 2016.
The hottest August reached 41.2°C in 1984. The coldest dipped to 8.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.5°C. Daytime highs moved from 30.9°C to 31.3°C and overnight lows from 18.7°C to 19.4°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 31.1°C daytime highs and 19.2°C at night.
Not quite — August is the 11th coolest month in Belleville, averaging 25.2°C.
For August in Belleville, pack light, breathable clothing and sun protection, with typical highs of 31.1°C and lows of 19.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 1.6 m/s. The windiest August on record averaged 1.8 m/s (1987).
The wettest August on record was 2016 with 180 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 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.
