Climate almanac
Vandalia
Illinois, United States · 38.96°, -89.09°
What is the weather like in Vandalia in May?
In May, Vandalia is typically 77°F (25°C) during the day and 58°F (15°C) at night. The month brings about 5.0 in (128 mm) of precipitation in total.
- Average high77°F (25°C)
- Average low58°F (15°C)
- Precipitation5.0 in (128 mm)
- Clear or mostly clear days9
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)