Grand Lake Saint Marys State Park Weather Forecast

    • 52
    • 63

    Rain Showers Likely

    • 49
    • 60

    Rain Showers Likely

    • 50
    • 70

    Mostly Cloudy

    • 41
    • 64

    Mostly Sunny

    • 45
    • 66

    Mostly Sunny

    • 52
    • 73

    Mostly Sunny

Today 5 May Mercer

Mostly cloudy. A chance of Showers this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Highs in the mid 60s. Southeast Winds around 5 Mph, becoming south late. Chance of rain 70 percent.

Tonight 5 May Mercer

Showers likely with a slight chance of Thunderstorms. Lows in the lower 50s. West Winds around 5 Mph. Chance of rain 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Saint Marys State Park Temperature Statistics

May Temperature

Versailles Darke County Airport (22.4 miles)

  • Lowest 2 May, 2025

    57.2 °F

  • Average May

    62.2 °F

  • Highest 1 May, 2025

    71.6 °F

Climate (2020–Present)

Versailles Darke County Airport (22.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.6 °F
Get WillyWeather+ to remove ads