O'Fallon Weather Forecast

    • 33
    • 51

    Increasing Clouds

    • 33
    • 52

    Decreasing Clouds

    • 38
    • 58

    Partly Sunny

    • 42
    • 52

    Chance Rain

    • 37
    • 58

    Mostly Sunny

    • 46
    • 62

    Mostly Cloudy

    • 52
    • 66

    Mostly Cloudy

Today 11 Feb St. Charles

Sunny. Much cooler with Highs in the lower 50s. Northwest Winds around 5 Mph.

Tonight 11 Feb St. Charles

Mostly clear this Evening, then becoming partly cloudy. Lows in the lower 30s. North Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Real-Time

O'Fallon Temperature Statistics

February Temperature

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Lowest 1 February, 2026

    -7.3 °F

  • Average February

    30.1 °F

  • Highest 9 February, 2026

    60.1 °F

Climate (2021–Present)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    57.1 °F

  • Average High 2021–2026

    68.3 °F
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