Potomac River - Hollis Marsh Weather Forecast

    • 66
    • 69

    Chance Rain Showers

    • 65
    • 75

    Partly Sunny

    • 65
    • 76

    Mostly Sunny

    • 65
    • 75

    Partly Sunny

    • 67
    • 78

    Partly Sunny

    • 66
    • 77

    Mostly Sunny

Today 10 Sep Westmoreland

Cloudy with a 40 percent chance of Showers. Highs in the upper 60s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 10 Sep Westmoreland

Cloudy. A slight chance of Showers in the Evening, then a slight chance of rain after midnight. Lows in the lower 60s. North Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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Potomac River - Hollis Marsh Temperature Statistics

September Temperature

St Marys County Airport (14.9 miles)

  • Lowest 3 September, 2025

    53.2 °F

  • Average September

    69.7 °F

  • Highest 4 September, 2025

    86.9 °F

Climate (2020–Present)

St Marys County Airport (14.9 miles)

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  • Average Low 2020–2025

    49.6 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    66.8 °F
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