Meramec State Park Weather Forecast

    • 64
    • 93

    Slight Chance Thunderstorms

    • 63
    • 92

    Partly Sunny

    • 63
    • 92

    Slight Chance Thunderstorms

    • 63
    • 89

    Chance Thunderstorms

    • 61
    • 84

    Chance Thunderstorms

    • 59
    • 82

    Chance Thunderstorms

Today 15 Sep Franklin

Partly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the lower 90s. Northeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 15 Sep Franklin

Partly cloudy. Lows in the mid 60s. Northeast Winds around 5 Mph.

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Meramec State Park Temperature Statistics

September Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 8 September, 2025

    42.8 °F

  • Average September

    67.2 °F

  • Highest 12 September, 2025

    95 °F

Climate (2020–Present)

Washington Regional Airport (26.1 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.8 °F

  • Average High 2020–2025

    68.7 °F
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