O'Fallon Weather Forecast

    • 39
    • 59

    Increasing Clouds

    • 45
    • 51

    Rain

    • 38
    • 56

    Slight Chance Rain

    • 44
    • 61

    Mostly Cloudy

    • 55
    • 65

    Mostly Cloudy

    • 48
    • 72

    Mostly Cloudy

Today 13 Feb St. Clair

Sunny. Highs around 60. South Winds 5 to 10 Mph.

Tonight 13 Feb St. Clair

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 40. South Winds around 5 Mph.

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O'Fallon Temperature Statistics

February Temperature

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

  • Lowest 1 February, 2026

    4.5 °F

  • Average February

    32.5 °F

  • Highest 10 February, 2026

    72.3 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    67.7 °F
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