Meramec State Park Weather Forecast

    • 44
    • 69

    Becoming Sunny

    • 50
    • 76

    Sunny

    • 57
    • 83

    Chance Rain Showers

    • 48
    • 77

    Sunny

    • 58
    • 80

    Partly Sunny

    • 66
    • 91

    Slight Chance Thunderstorms

Today 10 May Franklin

Mostly cloudy with isolated Showers this Morning, then partly sunny this afternoon. Cooler with Highs in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 10 May Franklin

Partly cloudy. Cooler with Lows in the mid 40s. North Winds around 5 Mph in the Evening, becoming light and variable.

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Meramec State Park Temperature Statistics

May Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 7 May, 2026

    39.2 °F

  • Average May

    58.4 °F

  • Highest 4 May, 2026

    84.2 °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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