Grand Lake St. Marys SPB Weather Forecast

    • 46
    • 65

    Rain Showers

    • 50
    • 56

    Rain Showers

    • 40
    • 64

    Rain Showers

    • 32
    • 46

    Chance Rain Showers

    • 25
    • 49

    Chance Rain Showers

    • 27
    • 41

    Mostly Sunny

Today 3 Apr Mercer

Partly cloudy Early, then becoming mostly cloudy. A 20 percent chance of Showers. Highs in the upper 60s. West Winds 10 to 15 Mph.

Tonight 3 Apr Mercer

Showers with a slight chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows in the mid 40s. Northwest Winds 5 to 10 Mph, becoming northeast after midnight. Chance of rain 80 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 1 April, 2025

    32 °F

  • Average April

    39.4 °F

  • Highest 1 April, 2025

    50 °F

Climate (2020–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.6 °F
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