O'Fallon Weather Forecast

    • 60
    • 76

    Slight Chance Rain Showers

    • 58
    • 71

    Mostly Cloudy

    • 56
    • 67

    Chance Rain Showers

    • 60
    • 72

    Rain Showers Likely

    • 53
    • 72

    Rain Showers Likely

    • 47
    • 68

    Chance Rain Showers

Today 30 Oct St. Charles

Partly sunny this Morning, then becoming mostly cloudy. Highs in the mid 70s. East Winds 5 to 10 Mph.

Tonight 30 Oct St. Charles

Mostly cloudy. Lows in the upper 50s. East Winds around 5 Mph.

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O'Fallon Temperature Statistics

October Temperature

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

  • Lowest 18 October, 2026

    35.7 °F

  • Average October

    63.1 °F

  • Highest 13 October, 2026

    93.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69.1 °F
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