O'Fallon Weather Forecast

    • 51
    • 66

    Rain Showers Likely

    • 66
    • 75

    Rain Showers

    • 68
    • 79

    Chance Thunderstorms

    • 64
    • 81

    Rain Showers

    • 58
    • 76

    Chance Rain Showers

    • 62
    • 82

    Slight Chance Thunderstorms

    • 58
    • 81

    Slight Chance Thunderstorms

Today 25 Apr St. Clair

Mostly cloudy. Near steady temperature in the lower 60s. East Winds 5 to 10 Mph.

Tonight 25 Apr St. Clair

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows around 50. Southeast Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Fallon Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

  • Lowest 6 April, 2024

    34.2 °F

  • Average April

    58.2 °F

  • Highest 14 April, 2024

    85.5 °F

Climate (2019–Present)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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  • Average Low 2019–2024

    47 °F

  • Average 2019–2024

    56.8 °F

  • Average High 2019–2024

    67 °F
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