Climate almanac
DeKalb
Illinois, United States · 41.93°, -88.75°
What is the weather like in DeKalb in August?
In August, DeKalb is typically 81°F (27°C) during the day and 64°F (18°C) at night. The month brings about 3.2 in (82 mm) of precipitation in total.
- Average high81°F (27°C)
- Average low64°F (18°C)
- Precipitation3.2 in (82 mm)
- Clear or mostly clear days13
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)