Lewis and Clark State Memorial Park Weather Forecast

    • 73
    • 98

    Slight Chance Thunderstorms

    • 73
    • 98

    Hot

    • 67
    • 94

    Rain Showers Likely

    • 60
    • 81

    Rain Showers Likely

    • 55
    • 72

    Mostly Cloudy

    • 56
    • 76

    Partly Sunny

    • 58
    • 77

    Partly Sunny

Today 18 Sep Madison

Sunny with a chance of Showers and Thunderstorms. Hot. Near steady temperature in the mid 90s. Southeast Winds around 5 Mph. Chance of rain 30 percent. Heat index Values up to 107.

Tonight 18 Sep Madison

Mostly clear. A slight chance of Showers and Thunderstorms this evening. Lows in the lower 70s. Southeast Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 102 early this evening.

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  • Temperature Real-Time

Lewis and Clark State Memorial Park Temperature Statistics

September Temperature

St. Louis Regional Airport (7.5 miles)

  • Lowest 8 September, 2026

    59 °F

  • Average September

    77.4 °F

  • Highest 5 September, 2026

    100.4 °F

Climate (2021–2026)

St. Louis Regional Airport (7.5 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    66.7 °F
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