Grand Lake St. Marys SPB Weather Forecast

    • 43
    • 67

    Sunny

    • 66
    • 77

    Mostly Sunny

    • 53
    • 80

    Rain Showers Likely

    • 58
    • 68

    Rain Showers

    • 54
    • 72

    Rain Showers

    • 43
    • 65

    Chance Rain Showers

Today 27 Apr Mercer

Sunny. Highs in the upper 60s. East Winds 5 to 10 Mph.

Tonight 27 Apr Mercer

Clear. Lows in the lower 40s. Southeast Winds 5 to 10 Mph.

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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 8 April, 2025

    23 °F
  • Average April

    50.3 °F
  • Highest 24 April, 2025

    82.4 °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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