Climate almanac
Vandalia
Illinois, United States · 38.96°, -89.09°
What is the weather like in Vandalia in August?
In August, Vandalia is typically 85°F (29°C) during the day and 67°F (19°C) at night. The month brings about 4.1 in (104 mm) of precipitation in total.
- Average high85°F (29°C)
- Average low67°F (19°C)
- Precipitation4.1 in (104 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)