Lake St Louis Weather Forecast

    • 62
    • 71

    Chance Rain Showers

    • 55
    • 72

    Mostly Cloudy

    • 54
    • 75

    Partly Sunny

    • 56
    • 75

    Mostly Cloudy

    • 56
    • 75

    Mostly Cloudy

    • 58
    • 75

    Mostly Cloudy

    • 60
    • 79

    Partly Sunny

Today 21 Sep St. Charles

Cloudy with a slight chance of Showers and very light drizzle. Much cooler. Near steady temperature in the lower 70s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 21 Sep St. Charles

Cloudy with a slight chance of very light drizzle. Lows in the lower 60s. Northeast Winds 5 to 10 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, 2026

    59.6 °F

  • Average September

    82 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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