Grand Lake St. Marys SPB Weather Forecast

    • 53
    • 64

    Cloudy

    • 54
    • 70

    Mostly Cloudy

    • 56
    • 66

    Mostly Cloudy

    • 61
    • 74

    Rain Showers Likely

    • 54
    • 70

    Rain Showers Likely

    • 50
    • 67

    Chance Rain Showers

    • 46
    • 63

    Chance Rain Showers

Today 31 Oct Mercer

Mostly cloudy in the Morning, then becoming partly cloudy. Highs in the lower 60s.

Tonight 31 Oct Mercer

Cloudy. Lows in the lower 50s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

October Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 18 October, 2026

    35.6 °F

  • Average October

    59.2 °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

    52.6 °F

  • Average High 2021–2026

    61.8 °F
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