Lake St Louis Weather Forecast

    • 73
    • 87

    Partly Sunny

    • 71
    • 97

    Chance Thunderstorms

    • 74
    • 94

    Slight Chance Thunderstorms

    • 72
    • 94

    Chance Thunderstorms

    • 73
    • 91

    Chance Rain Showers

    • 70
    • 90

    Slight Chance Thunderstorms

Today 14 Sep St. Charles

Sunny. Highs in the upper 80s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 14 Sep St. Charles

Mostly clear. Not as cool with Lows in the lower 70s. Southeast 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

    81.6 °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

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    69 °F
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