Saint Charles Weather Forecast

    • 30
    • 42

    Partly Sunny

    • 30
    • 37

    Chance Freezing Rain

    • 14
    • 38

    Mostly Cloudy

    • 24
    • 32

    Partly Sunny

    • 37
    • 46

    Mostly Cloudy

    • 22
    • 46

    Slight Chance Rain

Today 5 Dec St. Charles

Sunny. Not as cool with Highs in the lower 40s. South Winds 5 to 10 Mph.

Tonight 5 Dec St. Charles

Mostly cloudy and not as cool. Near steady temperature in the lower 30s. South Winds 5 to 10 Mph, becoming west after midnight.

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Saint Charles Temperature Statistics

December Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 2 December, 2025

    21.9 °F

  • Average December

    26.3 °F

  • Highest 3 December, 2025

    37 °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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