O'Fallon Weather Forecast
- 64
- 82
Partly Sunny
- 66
- 79
Chance Thunderstorms
- 62
- 73
Rain Showers Likely
- 62
- 79
Chance Rain Showers
- 63
- 82
Mostly Sunny
- 65
- 84
Slight Chance Thunderstorms
- 64
- 83
Chance Thunderstorms
Today 14 Aug St. Charles
Partly sunny. Near steady temperature in the lower 80s. Northwest Winds 5 to 10 Mph.
O'Fallon Temperature Statistics
August Temperature
St. Louis, Spirit Of St. Louis Airport (10.6 miles)
Lowest 11 August, 2022
59 °FAverage August
79 °FHighest 3 August, 2022
96.1 °F
Climate (2010–Present)
St. Louis, Spirit Of St. Louis Airport (10.6 miles)
Average Low 2010–Present
47.3 °FAverage 2010–Present
57 °FAverage High 2010–Present
67.5 °F