Potomac River - Rowley Bay Entrance Weather Forecast

    • 27
    • 50

    Becoming Sunny

    • 35
    • 43

    Chance Rain/Snow

    • 40
    • 51

    Slight Chance Rain

    • 38
    • 50

    Mostly Cloudy

    • 46
    • 53

    Chance Rain

    • 42
    • 60

    Chance Rain

    • 40
    • 52

    Mostly Cloudy

Today 21 Dec St. Marys

Sunny. Highs around 50. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 21 Dec St. Marys

Mostly clear. Lows in the mid 20s. Northwest Winds 5 to 10 Mph.

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Potomac River - Rowley Bay Entrance Temperature Statistics

December Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.7 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    36.5 °F

  • Highest 19 December, 2025

    57.9 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.7 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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