Potomac River - Calvert Bay Weather Forecast

    • 30
    • 52

    Rain Showers

    • 36
    • 36

    Rain/Sleet

    • 36
    • 45

    Slight Chance Rain

    • 41
    • 48

    Chance Rain

    • 26
    • 52

    Chance Rain

    • 26
    • 37

    Mostly Sunny

Today 25 Dec St. Marys

Partly sunny. A chance of rain Showers in the morning. Highs in the mid 50s. Southwest Winds 5 to 10 Mph, becoming west in the afternoon. Chance of rain 30 percent.

Tonight 25 Dec St. Marys

Partly cloudy. Lows around 30. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac River - Calvert Bay Temperature Statistics

December Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.1 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    36.8 °F

  • Highest 19 December, 2025

    57.9 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.1 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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