Potomac River - Monroe Bay Entrance Weather Forecast

    • 21
    • 33

    Partly Sunny

    • 30
    • 39

    Mostly Sunny

    • 34
    • 52

    Partly Sunny

    • 45
    • 56

    Rain Showers

    • 28
    • 51

    Mostly Sunny

    • 38
    • 45

    Partly Sunny

Today 15 Dec Westmoreland

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

Tonight 15 Dec Westmoreland

Mostly clear in the Evening, then becoming partly cloudy. Cold with Lows around 20. Southwest Winds around 5 Mph.

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Potomac River - Monroe Bay Entrance Temperature Statistics

December Temperature

St Marys County Airport (23 miles)

  • Lowest 9 December, 2025

    21 °F

  • Average December

    34.9 °F

  • Highest 4 December, 2025

    48.2 °F

Climate (2020–Present)

St Marys County Airport (23 miles)

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  • Average Low 2020–2025

    49.5 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    66.7 °F
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