Potomac River - Old Breton Beach Weather Forecast

    • 31
    • 51

    Becoming Sunny

    • 38
    • 41

    Chance Rain/Snow

    • 44
    • 52

    Chance Rain

    • 40
    • 48

    Chance Rain

    • 49
    • 52

    Slight Chance Rain

    • 42
    • 56

    Mostly Cloudy

Today 21 Dec St. Marys

Mostly sunny. Highs in the lower 50s. 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 - Old Breton Beach Temperature Statistics

December Temperature

St Marys County Airport (8.7 miles)

  • Lowest 15 December, 2025

    14.9 °F

  • Average December

    35.7 °F

  • Highest 19 December, 2025

    59.4 °F

Climate (2020–Present)

St Marys County Airport (8.7 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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