Potomac River - Hollis Marsh Weather Forecast

    • 38
    • 41

    Increasing Clouds

    • 33
    • 49

    Mostly Sunny

    • 18
    • 39

    Slight Chance Snow

    • 20
    • 22

    Snow

    • 21
    • 23

    Snow Likely

    • 14
    • 27

    Mostly Sunny

Today 21 Jan Westmoreland

Sunny. Highs in the lower 40s. South Winds 10 to 15 Mph.

Tonight 21 Jan Westmoreland

Partly cloudy. Not as cool with Lows in the mid 30s. Southwest Winds around 10 Mph.

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  • Temperature Real-Time

Potomac River - Hollis Marsh Temperature Statistics

January Temperature

St Marys County Airport (14.9 miles)

  • Lowest 16 January, 2026

    20.7 °F

  • Average January

    39.7 °F

  • Highest 7 January, 2026

    65.7 °F

Climate (2021–Present)

St Marys County Airport (14.9 miles)

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  • Average Low 2021–2026

    49.5 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    66.7 °F
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