Potomac River - McKays Beach Weather Forecast

    • 24
    • 32

    Mostly Sunny

    • 32
    • 39

    Mostly Sunny

    • 35
    • 51

    Partly Sunny

    • 42
    • 55

    Rain Likely

    • 28
    • 50

    Mostly Sunny

    • 39
    • 45

    Partly Sunny

Today 15 Dec St. Marys

Mostly sunny. Highs in the lower 30s. West Winds 5 to 10 Mph.

Tonight 15 Dec St. Marys

Partly cloudy in the Evening, then becoming mostly clear. Lows in the lower 20s. Southwest Winds 5 to 10 Mph.

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Potomac River - McKays Beach Temperature Statistics

December Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (7.5 miles)

  • Lowest 9 December, 2025

    21.9 °F

  • Average December

    36 °F

  • Highest 10 December, 2025

    48 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (7.5 miles)

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  • Average Low 2020–2025

    52 °F

  • Average 2020–2025

    60.5 °F

  • Average High 2020–2025

    68.9 °F
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