Lake Saint Louis Weather Forecast

    • 78
    • 96

    Decreasing Clouds

    • 78
    • 98

    Partly Sunny

    • 74
    • 96

    Rain Showers Likely

    • 70
    • 87

    Rain Showers Likely

    • 71
    • 85

    Chance Rain Showers

    • 72
    • 88

    Chance Rain Showers

Today 10 Aug St. Charles

Mostly sunny. A slight chance of Showers and Thunderstorms in the morning. Hot with Highs in the mid 90s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 110 in the afternoon.

Tonight 10 Aug St. Charles

Mostly clear. Near steady temperature in the upper 70s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Lake Saint Louis Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    62.7 °F

  • Average August

    75.2 °F

  • Highest 7 August, 2026

    90 °F

Climate (2021–2026)

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