Potomac River - Saint Margaret Island Weather Forecast

    • 79
    • 87

    Slight Chance Thunderstorms

    • 77
    • 86

    Slight Chance Thunderstorms

    • 76
    • 88

    Chance Thunderstorms

    • 74
    • 88

    Chance Thunderstorms

    • 71
    • 84

    Partly Sunny

    • 69
    • 81

    Partly Sunny

Today 1 Sep St. Marys

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Hot with Highs in the lower 90s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 1 Sep St. Marys

Partly cloudy with a slight chance of Showers. Isolated Thunderstorms. Lows in the mid 70s. South Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 20 percent.

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Potomac River - Saint Margaret Island Temperature Statistics

September Temperature

St Marys County Airport (14.3 miles)

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Climate (2021–2026)

St Marys County Airport (14.3 miles)

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  • Average Low 2021–2026

    49.4 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    66.9 °F
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