Grand Lake Saint Marys State Park Weather Forecast

    • 45
    • 70

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 48
    • 73

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 52
    • 72

    Mostly Sunny

    • 49
    • 74

    Partly Sunny

Today 24 Oct Mercer

Mostly sunny. Highs around 70. Southeast Winds around 5 Mph.

Tonight 24 Oct Mercer

Mostly clear. Lows in the mid 40s. Southeast Winds around 5 Mph.

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Grand Lake Saint Marys State Park Temperature Statistics

October Temperature

Versailles Darke County Airport (22.4 miles)

  • Lowest 18 October, 2026

    35.6 °F

  • Average October

    59.9 °F

  • Highest 13 October, 2026

    87.8 °F

Climate (2021–2026)

Versailles Darke County Airport (22.4 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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