Chesapeake Bay - Potomac River Entrance Weather Forecast

    • 48
    • 54

    Rain

    • 34
    • 55

    Rain

    • 41
    • 44

    Mostly Sunny

    • 31
    • 51

    Mostly Sunny

    • 34
    • 39

    Partly Sunny

    • 42
    • 46

    Slight Chance Rain

    • 41
    • 49

    Mostly Cloudy

Today 18 Dec St. Marys

Mostly cloudy. Highs in the upper 50s. Southeast Winds 5 to 10 Mph.

Tonight 18 Dec St. Marys

A chance of rain this Evening, then rain after midnight. Lows in the upper 40s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chesapeake Bay - Potomac River Entrance Temperature Statistics

December Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (9.3 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    34.5 °F

  • Highest 10 December, 2025

    48 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (9.3 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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