Meramec State Park Weather Forecast

    • 34
    • 42

    Mostly Sunny

    • 30
    • 57

    Increasing Clouds

    • 33
    • 46

    Partly Sunny

    • 46
    • 53

    Mostly Cloudy

    • 53
    • 65

    Mostly Cloudy

    • 59
    • 70

    Partly Sunny

    • 52
    • 74

    Partly Sunny

Today 19 Dec Franklin

Sunny. Much cooler with Highs in the lower 40s. South Winds 5 to 10 Mph.

Tonight 19 Dec Franklin

Mostly clear and not as cool. Near steady temperature in the mid 30s. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

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Meramec State Park Temperature Statistics

December Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 14 December, 2025

    8.6 °F

  • Average December

    32.5 °F

  • Highest 9 December, 2025

    59 °F

Climate (2020–Present)

Washington Regional Airport (26.1 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    69 °F
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