Meramec State Park Weather Forecast

    • 28
    • 45

    Increasing Clouds

    • 31
    • 44

    Mostly Cloudy

    • 17
    • 42

    Mostly Cloudy

    • 25
    • 36

    Partly Sunny

    • 35
    • 48

    Mostly Cloudy

    • 24
    • 49

    Mostly Cloudy

Today 5 Dec Franklin

Sunny. Not as cool with Highs in the mid 40s. Southwest Winds 5 to 10 Mph.

Tonight 5 Dec Franklin

Clear. Near steady temperature around 17. South Winds around 5 Mph.

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Meramec State Park Temperature Statistics

December Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 1 December, 2025

    23 °F

  • Average December

    25.7 °F

  • Highest 2 December, 2025

    28.4 °F

Climate (2020–Present)

Washington Regional Airport (26.1 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    69 °F
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