Climate almanac
Mattoon
Illinois, United States · 39.48°, -88.37°
What is the weather like in Mattoon in August?
In August, Mattoon is typically 83°F (29°C) during the day and 66°F (19°C) at night. The month brings about 3.8 in (98 mm) of precipitation in total.
- Average high83°F (29°C)
- Average low66°F (19°C)
- Precipitation3.8 in (98 mm)
- Clear or mostly clear days13
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)