Saint Charles Weather Forecast

    • 28
    • 36

    Becoming Sunny

    • 26
    • 43

    Partly Sunny

    • 29
    • 40

    Mostly Cloudy

    • 28
    • 46

    Mostly Cloudy

    • 28
    • 43

    Partly Sunny

    • 33
    • 49

    Partly Sunny

Today 30 Dec St. Charles

Mostly sunny. Highs in the mid 30s. West Winds 5 to 10 Mph.

Tonight 30 Dec St. Charles

Mostly clear. Not as cool with Lows in the upper 20s. West Winds 5 to 10 Mph.

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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

    37.1 °F

  • Highest 23 December, 2025

    66.9 °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

    69.2 °F
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