Potomac River - Old Breton Beach Weather Forecast

    • 77
    • 89

    Thunderstorms

    • 76
    • 85

    Rain Showers

    • 74
    • 82

    Rain Showers Likely

    • 74
    • 80

    Chance Thunderstorms

    • 77
    • 84

    Chance Thunderstorms

    • 77
    • 87

    Chance Thunderstorms

Today 5 Jul St. Marys

Mostly sunny. Hot with Highs in the mid 90s. Southeast Winds 5 to 10 Mph. Heat index Values up to 109.

Tonight 5 Jul St. Marys

Mostly cloudy. Scattered Showers and Thunderstorms. Some Thunderstorms may produce gusty Winds, frequent Lightning, and heavy rainfall in the evening. Lows in the mid 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming east after midnight. Chance of rain 50 percent.

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Potomac River - Old Breton Beach Temperature Statistics

July Temperature

St Marys County Airport (8.7 miles)

  • Lowest 1 July, 2026

    74.3 °F

  • Average July

    86.9 °F

  • Highest 3 July, 2026

    100 °F

Climate (2021–2026)

St Marys County Airport (8.7 miles)

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  • Average Low 2021–2026

    49.3 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    66.8 °F
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