Grand Lake Saint Marys State Park Weather Forecast

    • 58
    • 74

    Rain Showers

    • 51
    • 71

    Chance Thunderstorms

    • 44
    • 60

    Chance Rain Showers

    • 49
    • 64

    Slight Chance Rain Showers

    • 51
    • 69

    Partly Sunny

    • 54
    • 73

    Partly Sunny

Today 1 May Mercer

Showers likely with a slight chance of Thunderstorms in the Morning, then Showers with a chance of Thunderstorms in the afternoon. Highs in the upper 70s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

Tonight 1 May Mercer

Mostly cloudy with a chance of Showers and Thunderstorms. Warmer with Lows in the upper 50s. Southeast Winds 5 to 10 Mph. Chance of rain 40 percent.

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Grand Lake Saint Marys State Park Temperature Statistics

May 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

    43.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.6 °F
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