Potomac River - Saint Margaret Island Weather Forecast

    • 72
    • 88

    Sunny

    • 78
    • 97

    Hot

    • 78
    • 92

    Mostly Sunny

    • 77
    • 91

    Slight Chance Thunderstorms

    • 77
    • 91

    Chance Thunderstorms

    • 74
    • 87

    Chance Thunderstorms

Today 14 Jul St. Marys

Sunny. Highs in the upper 80s. West Winds around 5 Mph, becoming south in the afternoon.

Tonight 14 Jul St. Marys

Clear. Lows in the lower 70s. Southwest Winds 5 to 10 Mph.

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Potomac River - Saint Margaret Island Temperature Statistics

July Temperature

St Marys County Airport (14.3 miles)

  • Lowest 5 July, 2026

    70.7 °F

  • Average July

    81.3 °F

  • Highest 3 July, 2026

    100 °F

Climate (2021–2026)

St Marys County Airport (14.3 miles)

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  • Average Low 2021–2026

    49.4 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    66.9 °F
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