Lake Saint Louis Weather Forecast

    • 35
    • 42

    Increasing Clouds

    • 16
    • 39

    Mostly Cloudy

    • 22
    • 33

    Partly Sunny

    • 37
    • 48

    Mostly Cloudy

    • 26
    • 46

    Slight Chance Rain

    • 21
    • 41

    Mostly Cloudy

Today 6 Dec St. Charles

Partly sunny. Highs in the upper 30s. West Winds around 5 Mph, becoming southeast in the afternoon.

Tonight 6 Dec St. Charles

Mostly cloudy. Not as cool with Lows in the upper 20s. West Winds around 5 Mph.

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  • Temperature Real-Time

Lake Saint Louis Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (11.2 miles)

  • Lowest 3 December, 2025

    15.1 °F

  • Average December

    25.7 °F

  • Highest 3 December, 2025

    37.9 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (11.2 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    68.3 °F
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