Grand Lake St. Marys SPB Weather Forecast

    • 69
    • 81

    Chance Thunderstorms

    • 71
    • 83

    Chance Rain Showers

    • 70
    • 86

    Thunderstorms Likely

    • 63
    • 79

    Chance Thunderstorms

    • 67
    • 82

    Slight Chance Thunderstorms

    • 75
    • 87

    Partly Sunny

Today 16 Jun Mercer

Mostly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 80s. East Winds around 5 Mph, becoming southeast late. Chance of rain 20 percent.

Tonight 16 Jun Mercer

Mostly cloudy with a chance of Showers and Thunderstorms. Muggy. Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

June Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 1 June, 2025

    41 °F

  • Average June

    69.4 °F

  • Highest 3 June, 2025

    86 °F

Climate (2020–Present)

Versailles Darke County Airport (23 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.6 °F
Get WillyWeather+ to remove ads