Saint Charles Weather Forecast

    • 29
    • 34

    Increasing Clouds

    • 39
    • 55

    Mostly Cloudy

    • 26
    • 46

    Mostly Cloudy

    • 27
    • 38

    Mostly Cloudy

    • 15
    • 35

    Mostly Cloudy

    • 15
    • 24

    Mostly Cloudy

    • 21
    • 29

    Partly Sunny

Today 8 Dec St. Charles

Sunny. Near steady temperature in the lower 30s. West Winds around 5 Mph.

Tonight 8 Dec St. Charles

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the mid 20s. Temperature rising into the lower 30s after midnight. South Winds 5 to 10 Mph.

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Saint Charles Temperature Statistics

December Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 4 December, 2025

    14 °F

  • Average December

    28 °F

  • Highest 6 December, 2025

    46 °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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