Meramec State Park Weather Forecast

    • 63
    • 92

    Mostly Sunny

    • 62
    • 92

    Mostly Sunny

    • 64
    • 93

    Mostly Cloudy

    • 62
    • 83

    Chance Rain Showers

    • 63
    • 84

    Chance Rain Showers

    • 65
    • 84

    Chance Rain Showers

Today 16 Sep Franklin

Patchy fog this morning. Sunny. Highs in the lower 90s. Northeast Winds around 5 Mph.

Tonight 16 Sep Franklin

Mostly clear. Lows in the lower 60s. East Winds around 5 Mph.

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Meramec State Park Temperature Statistics

September Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 8 September, 2025

    42.8 °F

  • Average September

    68.3 °F

  • Highest 13 September, 2025

    96.8 °F

Climate (2020–Present)

Washington Regional Airport (26.1 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.8 °F

  • Average High 2020–2025

    68.7 °F
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