Meramec State Park Weather Forecast

    • 62
    • 81

    Slight Chance Thunderstorms

    • 63
    • 81

    Chance Rain Showers

    • 60
    • 77

    Chance Thunderstorms

    • 60
    • 81

    Chance Rain Showers

    • 57
    • 79

    Partly Sunny

    • 56
    • 81

    Mostly Sunny

Today 27 May Franklin

Mostly cloudy this Morning, then becoming partly sunny. Patchy fog this morning. A slight chance of Showers. A slight chance of Thunderstorms this afternoon. Highs in the lower 80s. Light and variable Winds, becoming north around 5 Mph this afternoon. Chance of rain 20 percent.

Tonight 27 May Franklin

Mostly cloudy. Areas of fog after midnight. Lows in the lower 60s. Northeast 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

    64.8 °F

  • Highest 17 May, 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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