Grand Lake St. Marys SPB Weather Forecast

    • 65
    • 78

    Chance Rain Showers

    • 70
    • 84

    Partly Sunny

    • 75
    • 91

    Mostly Sunny

    • 76
    • 93

    Mostly Sunny

    • 77
    • 94

    Mostly Sunny

    • 76
    • 94

    Mostly Sunny

Today 27 Jun Mercer

Cloudy. A slight chance of Showers this afternoon. Highs in the upper 70s. Northeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 27 Jun Mercer

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

June Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 3 June, 2026

    50 °F

  • Average June

    69.8 °F

  • Highest 7 June, 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

    61.7 °F
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