Climate almanac
Belleville
Illinois, United States · 38.52°, -89.98°
What is the weather like in Belleville in August?
In August, Belleville is typically 86°F (30°C) during the day and 69°F (20°C) at night. The month brings about 4.5 in (113 mm) of precipitation in total.
- Average high86°F (30°C)
- Average low69°F (20°C)
- Precipitation4.5 in (113 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)