Climate almanac
O'Fallon
Missouri, United States · 38.81°, -90.70°
What is the weather like in O'Fallon in March?
In March, O'Fallon is typically 59°F (15°C) during the day and 40°F (4°C) at night. The month brings about 4.4 in (113 mm) of precipitation in total. Snowfall averages about 0.7 in (17 mm) over the month.
- Average high59°F (15°C)
- Average low40°F (4°C)
- Precipitation4.4 in (113 mm)
- Clear or mostly clear days9
- Snowfall0.7 in (17 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)