Grand Lake St. Marys SPB Weather Forecast

    • 50
    • 72

    Partly Sunny

    • 56
    • 74

    Partly Sunny

    • 55
    • 76

    Partly Sunny

    • 54
    • 75

    Sunny

    • 57
    • 77

    Mostly Sunny

    • 63
    • 80

    Partly Sunny

Today 30 May Mercer

Partly cloudy. Highs in the lower 70s. Northeast Winds 10 to 15 Mph.

Tonight 30 May Mercer

Partly cloudy in the Evening, then clearing. Lows in the upper 40s. East Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

May Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    59.4 °F

  • Highest 18 May, 2026

    86 °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

    61.7 °F
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