O'Fallon Weather Forecast

    • 59
    • 80

    Becoming Sunny

    • 63
    • 81

    Partly Sunny

    • 67
    • 83

    Slight Chance Thunderstorms

    • 68
    • 84

    Chance Thunderstorms

    • 69
    • 86

    Mostly Sunny

    • 72
    • 89

    Mostly Sunny

Today 2 Aug St. Clair

Sunny. Highs around 80. Northeast Winds 5 to 10 Mph.

Tonight 2 Aug St. Clair

Mostly clear. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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O'Fallon Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.2 °F

  • Average High 2020–2025

    67.3 °F
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