Potomac River - Hollis Marsh Weather Forecast

    • 77
    • 88

    Partly Sunny

    • 72
    • 81

    Partly Sunny

    • 72
    • 79

    Mostly Sunny

    • 72
    • 80

    Mostly Sunny

    • 76
    • 84

    Mostly Sunny

    • 80
    • 90

    Mostly Sunny

Today 20 Jul Westmoreland

Partly sunny. Humid with Highs in the lower 90s. West Winds 5 to 10 Mph. Heat index Values up to 102.

Tonight 20 Jul Westmoreland

Partly cloudy with a slight chance of Showers and Thunderstorms. Humid with Lows in the mid 70s. Northwest Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 102 early in the evening.

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Potomac River - Hollis Marsh Temperature Statistics

July Temperature

St Marys County Airport (14.9 miles)

  • Lowest 5 July, 2025

    62.6 °F

  • Average July

    78 °F

  • Highest 1 July, 2025

    91.4 °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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