St. Charles Airport Weather Forecast

    • 32
    • 39

    Mostly Sunny

    • 27
    • 55

    Partly Sunny

    • 29
    • 42

    Partly Sunny

    • 41
    • 47

    Partly Sunny

    • 48
    • 62

    Mostly Cloudy

    • 54
    • 67

    Mostly Cloudy

Today 19 Dec St. Charles

Sunny. Much cooler with Highs in the upper 30s. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph, becoming southwest 5 to 10 Mph in the afternoon.

Tonight 19 Dec St. Charles

Mostly clear in the Evening, then becoming partly cloudy. Near steady temperature in the lower 30s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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St. Charles Airport Temperature Statistics

December Temperature

St. Charles, St. Charles County Smartt Airport (6.2 miles)

  • Lowest 14 December, 2025

    6.1 °F

  • Average December

    28.4 °F

  • Highest 16 December, 2025

    57 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (6.2 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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