Grand Lake Saint Marys State Park Weather Forecast

    • 42
    • 57

    Mostly Cloudy

    • 35
    • 51

    Partly Sunny

    • 37
    • 55

    Mostly Sunny

    • 46
    • 61

    Chance Rain Showers

    • 42
    • 61

    Rain Showers Likely

    • 36
    • 55

    Partly Sunny

Today 19 Apr Mercer

Mostly cloudy with a chance of Showers in the Morning, then partly cloudy in the afternoon. Cooler with Highs in the upper 50s. Northwest Winds 15 to 20 Mph. Chance of rain 40 percent.

Tonight 19 Apr Mercer

Showers with a chance of Thunderstorms. Lows in the upper 40s. South Winds around 10 Mph, becoming southwest late. Chance of rain 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Saint Marys State Park Temperature Statistics

April Temperature

Versailles Darke County Airport (22.4 miles)

  • Lowest 6 April, 2024

    32 °F

  • Average April

    52.5 °F

  • Highest 16 April, 2024

    80.6 °F

Climate (2019–Present)

Versailles Darke County Airport (22.4 miles)

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  • Average Low 2019–2024

    43.2 °F

  • Average 2019–2024

    52.1 °F

  • Average High 2019–2024

    61.4 °F
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