Grand Lake St. Marys SPB Weather Forecast

    • 42
    • 57

    Chance Rain

    • 42
    • 68

    Mostly Cloudy

    • 49
    • 64

    Partly Sunny

    • 32
    • 68

    Slight Chance Rain Showers

    • 28
    • 45

    Partly Sunny

    • 35
    • 50

    Mostly Cloudy

Today 19 Mar Mercer

Mostly Cloudy, then becoming partly cloudy this late morning and early Afternoon, then becoming mostly sunny. Warmer with Highs in the upper 50s. Southwest Winds around 5 Mph.

Tonight 19 Mar Mercer

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the lower 40s. East Winds around 5 Mph, becoming south after midnight.

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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 16 March, 2026

    21.2 °F

  • Average March

    48.1 °F

  • Highest 6 March, 2026

    75.2 °F

Climate (2021–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    61.6 °F
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