Grand Lake Saint Marys State Park Weather Forecast

    • 62
    • 82

    Slight Chance Thunderstorms

    • 61
    • 79

    Partly Sunny

    • 64
    • 82

    Rain Showers Likely

    • 57
    • 78

    Chance Rain Showers

    • 62
    • 77

    Chance Thunderstorms

    • 56
    • 73

    Chance Rain Showers

Today 22 May Mercer

Partly cloudy late this Morning, then clearing. A slight chance of Showers and Thunderstorms late this morning. Highs in the lower 80s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

Tonight 22 May Mercer

Partly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the lower 60s. West Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming northwest around 5 Mph after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Saint Marys State Park Temperature Statistics

May Temperature

Versailles Darke County Airport (22.4 miles)

  • Lowest 12 May, 2024

    44.6 °F
  • Average May

    65.8 °F
  • Highest 19 May, 2024

    86 °F

Climate (2019–Present)

Versailles Darke County Airport (22.4 miles)

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  • Average Low 2019–2024

    43.3 °F
  • Average 2019–2024

    52.2 °F
  • Average High 2019–2024

    61.5 °F
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