O'Fallon Weather Forecast
- 57
- 79
Chance Rain Showers
- 54
- 76
Mostly Sunny
- 62
- 81
Partly Sunny
- 66
- 86
Slight Chance Thunderstorms
- 70
- 91
Mostly Sunny
- 68
- 92
Mostly Sunny
Today 9 Jun St. Clair
Mostly cloudy in the Morning, then becoming partly sunny. A slight chance of Thunderstorms in the morning. A chance of Showers. Highs in the upper 70s. North Winds 5 to 10 Mph. Chance of rain 50 percent.
Tonight 9 Jun St. Clair
Mostly cloudy. Lows in the mid 60s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.
O'Fallon Temperature Statistics
June Temperature
Belleville, Scott AFB/MidAmerica Airport (4.3 miles)
Lowest 2 June, 2024
61.9 °FAverage June
74.1 °FHighest 3 June, 2024
88 °F
Climate (2019–Present)
Belleville, Scott AFB/MidAmerica Airport (4.3 miles)
Take a look at our website widgetsAvailable free! Find Out MoreAverage Low 2019–2024
47.1 °FAverage 2019–2024
56.9 °FAverage High 2019–2024
67 °F