O'Fallon Weather Forecast

    • 50
    • 70

    Becoming Sunny

    • 51
    • 73

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

    • 48
    • 71

    Sunny

    • 50
    • 73

    Mostly Sunny

    • 55
    • 80

    Mostly Sunny

Today 2 Oct St. Charles

Cloudy with a chance of Showers this Morning, then partly sunny this afternoon. Much cooler with Highs in the lower 70s. North Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 2 Oct St. Charles

Partly cloudy in the Evening, then clearing. Cooler with Lows around 50. Northeast Winds 5 to 10 Mph.

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O'Fallon Temperature Statistics

October Temperature

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

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Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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