Climate almanac
Waterloo
Illinois, United States · 38.34°, -90.15°
What is the weather like in Waterloo in August?
In August, Waterloo is typically 86°F (30°C) during the day and 69°F (20°C) at night. The month brings about 4.5 in (115 mm) of precipitation in total.
- Average high86°F (30°C)
- Average low69°F (20°C)
- Precipitation4.5 in (115 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)