Meramec State Park Weather Forecast

    • 68
    • 83

    Chance Thunderstorms

    • 65
    • 84

    Mostly Cloudy

    • 66
    • 88

    Mostly Sunny

    • 65
    • 87

    Mostly Sunny

    • 65
    • 83

    Chance Rain Showers

    • 67
    • 86

    Partly Sunny

    • 68
    • 88

    Partly Sunny

Today 19 Aug Franklin

Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Southeast Winds around 5 Mph. Chance of rain 50 percent.

Tonight 19 Aug Franklin

Mostly cloudy with a slight chance of Showers and Thunderstorms. Patchy fog after midnight. Lows in the upper 60s. Northeast Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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Meramec State Park Temperature Statistics

August Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 3 August, 2026

    62.6 °F

  • Average August

    78.8 °F

  • Highest 13 August, 2026

    96.8 °F

Climate (2021–2026)

Washington Regional Airport (26.1 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.6 °F
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