Grand Lake St. Marys SPB Weather Forecast

    • 50
    • 61

    Slight Chance Rain Showers

    • 58
    • 72

    Chance Thunderstorms

    • 45
    • 66

    Rain Showers

    • 43
    • 56

    Chance Rain Showers

    • 41
    • 56

    Chance Rain Showers

    • 45
    • 60

    Chance Rain Showers

Today 3 May Mercer

Sunny, then becoming partly cloudy early this Afternoon, then becoming mostly cloudy. Areas of frost this morning. Highs in the lower 60s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 3 May Mercer

Mostly cloudy with a slight chance of Showers in the Evening, then partly cloudy after midnight. Warmer with Lows in the upper 40s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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Grand Lake St. Marys SPB Temperature Statistics

May Temperature

Versailles Darke County Airport (23 miles)

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Climate (2021–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2021–2026

    43.2 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    61.7 °F
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