Grand Lake St. Marys SPB Weather Forecast

    • 37
    • 51

    Decreasing Clouds

    • 49
    • 54

    Chance Rain

    • 41
    • 65

    Chance Rain

    • 42
    • 62

    Rain Likely

    • 31
    • 51

    Chance Rain

    • 25
    • 42

    Chance Rain

Today 16 Feb Mercer

Areas of fog in the morning. Partly cloudy. Highs in the lower 50s. Southwest Winds 10 to 15 Mph.

Tonight 16 Feb Mercer

Partly cloudy. Lows in the lower 30s. West Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake St. Marys SPB Temperature Statistics

February Temperature

Versailles Darke County Airport (23 miles)

  • Lowest 5 February, 2026

    -5.8 °F

  • Average February

    21.7 °F

  • Highest 10 February, 2026

    50 °F

Climate (2021–Present)

Versailles Darke County Airport (23 miles)

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  • Average Low 2021–2026

    43 °F

  • Average 2021–2026

    52.2 °F

  • Average High 2021–2026

    61.4 °F
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