Lake Saint Louis Weather Forecast

    • 65
    • 93

    Thunderstorms

    • 62
    • 83

    Chance Thunderstorms

    • 66
    • 86

    Chance Rain Showers

    • 65
    • 82

    Rain Showers Likely

    • 63
    • 82

    Chance Rain Showers

    • 59
    • 81

    Chance Rain Showers

Today 18 Sep St. Charles

Sunny. Near steady temperature in the mid 90s. Southeast Winds around 5 Mph.

Tonight 18 Sep St. Charles

Partly cloudy in the Evening, then becoming mostly cloudy. Isolated Showers and Thunderstorms. Lows in the mid 60s. Northeast Winds around 5 Mph, becoming north after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Saint Louis Temperature Statistics

September Temperature

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

  • Lowest 8 September, 2025

    41 °F

  • Average September

    70.3 °F

  • Highest 14 September, 2025

    98.1 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.9 °F

  • Average High 2020–2025

    68.1 °F
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