Saint Charles Weather Forecast

    • 46
    • 56

    Partly Sunny

    • 24
    • 57

    Rain

    • 34
    • 40

    Partly Sunny

    • 30
    • 56

    Partly Sunny

    • 31
    • 46

    Mostly Cloudy

    • 37
    • 45

    Mostly Cloudy

Today 17 Dec St. Charles

Sunny. Highs in the mid 50s. West Winds around 5 Mph, becoming southeast this afternoon.

Tonight 17 Dec St. Charles

Mostly clear in the Evening, then mostly cloudy with a slight chance of rain after midnight. Lows in the mid 40s. Temperature rising into the lower 50s after midnight. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

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Saint Charles Temperature Statistics

December Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    29.5 °F

  • Highest 9 December, 2025

    55.9 °F

Climate (2020–Present)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2020–2025

    50.5 °F

  • Average 2020–2025

    59.8 °F

  • Average High 2020–2025

    69.1 °F
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