Meramec State Park Weather Forecast

    • 73
    • 92

    Mostly Cloudy

    • 64
    • 86

    Rain Showers

    • 51
    • 69

    Chance Rain Showers

    • 51
    • 70

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

    • 46
    • 70

    Sunny

    • 51
    • 71

    Mostly Sunny

Today 30 Sep Franklin

Mostly sunny. Highs in the upper 70s.

Tonight 30 Sep Franklin

Mostly cloudy. Lows in the lower 70s. South Winds 5 to 10 Mph.

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Meramec State Park Temperature Statistics

September Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 25 September, 2026

    53.6 °F

  • Average September

    76.8 °F

  • Highest 5 September, 2026

    102.2 °F

Climate (2021–2026)

Washington Regional Airport (26.1 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.7 °F
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