Grand Lake St. Marys SPB Weather Forecast

    • 60
    • 75

    Rain Showers

    • 55
    • 74

    Mostly Sunny

    • 56
    • 74

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 64
    • 78

    Chance Rain Showers

    • 64
    • 80

    Partly Sunny

Today 22 Aug Mercer

Partly cloudy with a chance of Showers and Thunderstorms. Near steady Temperatures in the mid 70s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

Tonight 22 Aug Mercer

Clear. Lows in the upper 50s. Northwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

August Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 4 August, 2026

    53.6 °F

  • Average August

    72.3 °F

  • Highest 8 August, 2026

    87.8 °F

Climate (2021–2026)

Versailles Darke County Airport (23 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    61.8 °F
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