Grand Lake St. Marys SPB Weather Forecast

    • 42
    • 56

    Rain Showers Likely

    • 34
    • 53

    Mostly Cloudy

    • 34
    • 52

    Partly Sunny

    • 49
    • 61

    Mostly Cloudy

    • 52
    • 68

    Chance Thunderstorms

    • 52
    • 68

    Rain Showers Likely

Today 30 Apr Mercer

Partly cloudy. Highs in the upper 50s. Northwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 30 Apr Mercer

Partly cloudy with a chance of Showers in the Evening, then mostly cloudy with Showers likely after midnight. Lows in the lower 40s. Northwest Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

April Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 7 April, 2026

    28.4 °F

  • Average April

    57.4 °F

  • Highest 13 April, 2026

    80.6 °F

Climate (2021–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2021–2026

    43.2 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    61.7 °F
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