Climate almanac
O'Fallon
Missouri, United States · 38.81°, -90.70°
What is the weather like in O'Fallon in April?
In April, O'Fallon is typically 68°F (20°C) during the day and 47°F (8°C) at night. The month brings about 4.8 in (121 mm) of precipitation in total. Snowfall averages about 0.3 in (9 mm) over the month.
- Average high68°F (20°C)
- Average low47°F (8°C)
- Precipitation4.8 in (121 mm)
- Clear or mostly clear days10
- Snowfall0.3 in (9 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)