Grand Lake St. Marys SPB Weather Forecast

    • 45
    • 65

    Mostly Sunny

    • 57
    • 74

    Rain Showers Likely

    • 46
    • 71

    Rain Showers Likely

    • 31
    • 50

    Partly Sunny

    • 41
    • 52

    Mostly Sunny

    • 53
    • 66

    Mostly Cloudy

    • 37
    • 66

    Chance Rain Showers

Today 13 Mar Mercer

Sunny. Highs in the upper 60s. East Winds around 5 Mph.

Tonight 13 Mar Mercer

Mostly clear. Warmer with Lows in the mid 40s. East Winds around 5 Mph, becoming southeast late.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

March Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 2 March, 2025

    15.8 °F

  • Average March

    38.6 °F

  • Highest 11 March, 2025

    68 °F

Climate (2020–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    61.5 °F
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