Patuxent River - Thomas Johnson Bridge Weather Forecast

    • 31
    • 59

    Rain Showers

    • 39
    • 44

    Mostly Sunny

    • 29
    • 50

    Partly Sunny

    • 32
    • 39

    Mostly Cloudy

    • 40
    • 45

    Slight Chance Rain

    • 39
    • 49

    Partly Sunny

Today 19 Dec St. Marys

Mostly cloudy late this Morning, then clearing. Scattered Showers late this morning. Breezy with Highs in the lower 60s. Temperature falling into the mid 40s this afternoon. West Winds 20 to 25 Mph. Gusts up to 45 Mph this afternoon. Chance of rain 50 percent.

Tonight 19 Dec St. Marys

Mostly clear and Breezy, cooler with Lows in the upper 20s. West Winds 20 to 25 Mph with Gusts up to 40 Mph, becoming northwest 5 to 10 Mph with Gusts up to 20 Mph after midnight.

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Patuxent River - Thomas Johnson Bridge Temperature Statistics

December Temperature

St Marys County Airport (3.7 miles)

  • Lowest 15 December, 2025

    14.9 °F

  • Average December

    34 °F

  • Highest 17 December, 2025

    56.3 °F

Climate (2020–Present)

St Marys County Airport (3.7 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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