Grand Lake St. Marys SPB Weather Forecast

    • 67
    • 85

    Chance Thunderstorms

    • 55
    • 74

    Rain Showers

    • 57
    • 73

    Mostly Sunny

    • 60
    • 76

    Chance Rain Showers

    • 67
    • 78

    Rain Showers

    • 61
    • 79

    Chance Thunderstorms

Today 13 Jun Mercer

Mostly sunny. Highs in the mid 80s. Southwest Winds 5 to 10 Mph.

Tonight 13 Jun Mercer

Partly cloudy. A chance of Showers and Thunderstorms after midnight. Lows in the mid 60s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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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

    73.3 °F

  • Highest 7 June, 2026

    87.8 °F

Climate (2021–Present)

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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