Lake St Louis Weather Forecast

    • 45
    • 56

    Mostly Cloudy

    • 45
    • 64

    Partly Sunny

    • 58
    • 70

    Mostly Cloudy

    • 57
    • 76

    Partly Sunny

    • 47
    • 66

    Partly Sunny

    • 36
    • 66

    Slight Chance Rain

Today 22 Dec St. Charles

Mostly cloudy. Not as cool with Highs in the mid 50s. South Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 22 Dec St. Charles

Partly cloudy and not as cool. Near steady temperature in the mid 40s. South Winds 5 to 10 Mph.

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Lake St Louis Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    33 °F

  • Highest 18 December, 2025

    57.9 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    57 °F

  • Average High 2020–2025

    68.2 °F
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