O'Fallon Weather Forecast

    • 37
    • 67

    Chance Rain

    • 26
    • 41

    Partly Sunny

    • 26
    • 42

    Mostly Sunny

    • 43
    • 55

    Partly Sunny

    • 38
    • 64

    Mostly Sunny

    • 42
    • 61

    Partly Sunny

Today 8 Nov St. Clair

Mostly cloudy. A chance of rain in the afternoon. Highs in the mid 60s. Northwest Winds around 5 Mph, becoming south around 5 Mph in the afternoon. Chance of rain 40 percent.

Tonight 8 Nov St. Clair

Mostly cloudy. A chance of rain in the Evening, then a chance of Sprinkles and Flurries after midnight. Lows in the mid 30s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 50 percent.

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O'Fallon Temperature Statistics

November Temperature

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

  • Lowest 2 November, 2025

    35.1 °F

  • Average November

    50.9 °F

  • Highest 5 November, 2025

    72.7 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    57.5 °F

  • Average High 2020–2025

    67.6 °F
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