Lake St Louis Weather Forecast

    • 75
    • 94

    Partly Sunny

    • 70
    • 93

    Chance Thunderstorms

    • 67
    • 86

    Partly Sunny

    • 74
    • 90

    Mostly Sunny

    • 67
    • 90

    Slight Chance Thunderstorms

    • 64
    • 82

    Slight Chance Thunderstorms

Today 15 Aug St. Charles

Partly sunny. Highs in the mid 90s. Southwest Winds around 5 Mph. Heat index Values up to 109.

Tonight 15 Aug St. Charles

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the mid 70s. Southwest Winds around 5 Mph. Heat index Values up to 109 early in the evening.

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Lake St Louis Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    62.7 °F

  • Average August

    78.9 °F

  • Highest 11 August, 2026

    95.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    68.9 °F
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