Lake St Louis Weather Forecast

    • 48
    • 75

    Rain Showers

    • 44
    • 64

    Mostly Sunny

    • 47
    • 73

    Sunny

    • 38
    • 63

    Mostly Sunny

    • 45
    • 65

    Partly Sunny

    • 44
    • 69

    Slight Chance Rain Showers

Today 18 Oct St. Charles

A chance of Thunderstorms. Showers likely in the Morning, then Showers in the afternoon. Locally heavy rainfall possible in the afternoon. Highs in the mid 70s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 18 Oct St. Charles

Showers with a chance of Thunderstorms in the Evening, then Showers likely after midnight. Cooler with Lows around 50. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph, increasing to northwest 15 to 20 Mph with Gusts up to 35 Mph after midnight. Chance of rain near 100 percent.

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Lake St Louis Temperature Statistics

October Temperature

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

  • Lowest 9 October, 2025

    42.1 °F

  • Average October

    66.5 °F

  • Highest 3 October, 2025

    88 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57 °F

  • Average High 2020–2025

    68.3 °F
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