Grand Lake Saint Marys State Park Weather Forecast

    • 20
    • 33

    Mostly Cloudy

    • 4
    • 23

    Partly Sunny

    • 18
    • 27

    Mostly Cloudy

    • 20
    • 30

    Mostly Cloudy

    • 15
    • 28

    Mostly Cloudy

    • 16
    • 25

    Chance Snow

Today 3 Dec Mercer

Mostly Cloudy, then becoming partly cloudy late this Morning, then becoming mostly cloudy. Highs in the lower 30s. Southwest Winds 10 to 15 Mph.

Tonight 3 Dec Mercer

Snow. Little or no snow accumulation. Lows 15 to 20. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of snow 80 percent.

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Grand Lake Saint Marys State Park Temperature Statistics

December Temperature

Versailles Darke County Airport (22.4 miles)

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Climate (2020–Present)

Versailles Darke County Airport (22.4 miles)

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  • Average Low 2020–2025

    43.3 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    61.5 °F
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