Lake St Louis Weather Forecast

    • 66
    • 94

    Mostly Sunny

    • 63
    • 92

    Mostly Sunny

    • 63
    • 93

    Mostly Sunny

    • 66
    • 93

    Chance Rain Showers

    • 63
    • 84

    Chance Thunderstorms

    • 63
    • 84

    Chance Thunderstorms

    • 63
    • 82

    Chance Rain Showers

Today 15 Sep St. Charles

Sunny. Near steady temperature in the lower 90s. East Winds 5 to 10 Mph.

Tonight 15 Sep St. Charles

Mostly clear. Lows in the mid 60s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake St Louis Temperature Statistics

September Temperature

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

  • Lowest 8 September, 2025

    41 °F

  • Average September

    68.4 °F

  • Highest 13 September, 2025

    97 °F

Climate (2020–Present)

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