Lake St Louis Weather Forecast

    • 73
    • 90

    Chance Thunderstorms

    • 74
    • 91

    Chance Thunderstorms

    • 74
    • 93

    Slight Chance Thunderstorms

    • 72
    • 91

    Mostly Sunny

    • 75
    • 95

    Partly Sunny

    • 70
    • 93

    Slight Chance Thunderstorms

Today 16 Jul St. Charles

Sunny with a slight chance of Showers and Thunderstorms this Morning, then partly sunny with Thunderstorms likely with a chance of Showers this afternoon. Highs in the lower 90s. Light and variable Winds, becoming southeast around 5 Mph this afternoon. Chance of rain 70 percent. Heat index Values up to 100.

Tonight 16 Jul St. Charles

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Humid with Lows in the mid 70s. Southwest Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 50 percent.

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Lake St Louis Temperature Statistics

July Temperature

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

  • Lowest 13 July, 2026

    66 °F

  • Average July

    80 °F

  • Highest 2 July, 2026

    96.7 °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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