Climate almanac
O'Fallon
Missouri, United States · 38.81°, -90.70°
What is the weather like in O'Fallon in July?
In July, O'Fallon is typically 88°F (31°C) during the day and 71°F (22°C) at night. The month brings about 4.2 in (106 mm) of precipitation in total.
- Average high88°F (31°C)
- Average low71°F (22°C)
- Precipitation4.2 in (106 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)