Grand Lake St. Marys SPB Weather Forecast

    • 30
    • 53

    Sunny

    • 39
    • 62

    Sunny

    • 42
    • 67

    Mostly Sunny

    • 44
    • 70

    Mostly Sunny

    • 46
    • 70

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 47
    • 70

    Mostly Sunny

Today 17 Oct Mercer

Sunny. Highs in the mid 50s. North Winds 5 to 10 Mph with Gusts up to 25 Mph.

Tonight 17 Oct Mercer

Clear. Widespread frost after midnight. Lows around 30. Light and variable Winds, becoming south around 5 Mph late.

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Grand Lake St. Marys SPB Temperature Statistics

October Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 6 October, 2026

    41 °F

  • Average October

    63.1 °F

  • Highest 13 October, 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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