O'Fallon Weather Forecast

    • 64
    • 87

    Mostly Sunny

    • 67
    • 88

    Becoming Sunny

    • 71
    • 90

    Sunny

    • 73
    • 93

    Mostly Sunny

    • 74
    • 93

    Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

    • 69
    • 86

    Chance Thunderstorms

Today 1 Jul St. Charles

Sunny. Near steady temperature in the mid 80s. Northwest Winds 5 to 10 Mph.

Tonight 1 Jul St. Charles

Mostly clear. Lows in the mid 60s. Northwest Winds 5 to 10 Mph this Evening, becoming light and variable.

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O'Fallon Temperature Statistics

July Temperature

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

  • Lowest

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  • Average July

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Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.8 °F

  • Average High 2020–2025

    68 °F
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