Meramec State Park Weather Forecast

    • 50
    • 83

    Thunderstorms

    • 49
    • 74

    Rain Showers

    • 42
    • 66

    Mostly Sunny

    • 46
    • 70

    Partly Sunny

    • 42
    • 67

    Partly Sunny

    • 45
    • 69

    Partly Sunny

Today 27 Apr Franklin

Mostly cloudy with a chance of Showers and Thunderstorms this Morning, then partly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may be severe with damaging Winds and large hail this morning. Highs in the lower 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 27 Apr Franklin

Partly cloudy. Showers and Thunderstorms in the evening. Cooler with Lows in the upper 40s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming west around 5 Mph with Gusts up to 20 Mph after midnight. Chance of rain 90 percent.

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Meramec State Park Temperature Statistics

April Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 6 April, 2026

    35.6 °F

  • Average April

    63.5 °F

  • Highest 17 April, 2026

    86 °F

Climate (2021–Present)

Washington Regional Airport (26.1 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    69.6 °F
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