St. Charles County Smartt Airport Weather Forecast

    • 60
    • 75

    Mostly Sunny

    • 51
    • 70

    Chance Rain Showers

    • 50
    • 76

    Mostly Sunny

    • 49
    • 74

    Sunny

    • 53
    • 78

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 62
    • 87

    Mostly Sunny

Today 4 Sep St. Charles

Sunny, cooler with Highs in the mid 70s. West Winds around 5 Mph.

Tonight 4 Sep St. Charles

Mostly clear. Lows around 60. South Winds around 5 Mph.

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St. Charles County Smartt Airport Temperature Statistics

September Temperature

St. Charles, St. Charles County Smartt Airport (0 miles)

  • Lowest 1 September, 2025

    60.1 °F

  • Average September

    69.8 °F

  • Highest 2 September, 2025

    82.9 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (0 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.4 °F
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