St. Charles County Smartt Airport Weather Forecast

    • 27
    • 44

    Partly Cloudy

    • 33
    • 49

    Partly Sunny

    • 40
    • 50

    Partly Sunny

    • 20
    • 55

    Rain Showers Likely

    • 30
    • 37

    Partly Sunny

    • 30
    • 55

    Mostly Cloudy

    • 33
    • 47

    Mostly Cloudy

Today 15 Dec St. Charles

Sunny. Not as cool with Highs in the lower 40s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 15 Dec St. Charles

Mostly clear this Evening, then becoming partly cloudy. Not as cool with Lows in the upper 20s. South Winds around 5 Mph.

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St. Charles County Smartt Airport Temperature Statistics

December Temperature

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

  • Lowest 5 December, 2025

    8.1 °F

  • Average December

    28.9 °F

  • Highest 9 December, 2025

    54 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.7 °F

  • Average High 2020–2025

    68.4 °F
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