Climate almanac
Chester
Illinois, United States · 37.91°, -89.82°
What is the weather like in Chester in August?
In August, Chester is typically 86°F (30°C) during the day and 69°F (20°C) at night. The month brings about 4.3 in (109 mm) of precipitation in total.
- Average high86°F (30°C)
- Average low69°F (20°C)
- Precipitation4.3 in (109 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)