Climate almanac
O'Fallon
Missouri, United States · 38.81°, -90.70°
What is the weather like in O'Fallon in October?
In October, O'Fallon is typically 70°F (21°C) during the day and 50°F (10°C) at night. The month brings about 3.4 in (85 mm) of precipitation in total.
- Average high70°F (21°C)
- Average low50°F (10°C)
- Precipitation3.4 in (85 mm)
- Clear or mostly clear days14
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)