Potomac River - McKays Beach Weather Forecast

    • 73
    • 91

    Thunderstorms Likely

    • 69
    • 76

    Chance Rain Showers

    • 68
    • 80

    Mostly Sunny

    • 68
    • 81

    Partly Sunny

    • 70
    • 82

    Partly Sunny

    • 72
    • 82

    Slight Chance Thunderstorms

Today 31 Jul St. Marys

Sunny late this Morning, then becoming partly sunny. A slight chance of Showers and Thunderstorms late this Morning, then a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this afternoon. Highs in the lower 90s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 31 Jul St. Marys

Mostly cloudy. Showers and Thunderstorms likely in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible in the evening. Lows in the lower 70s. East Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 70 percent.

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Potomac River - McKays Beach Temperature Statistics

July Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (7.5 miles)

  • Lowest 5 July, 2025

    66 °F

  • Average July

    80.7 °F

  • Highest 1 July, 2025

    94.6 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (7.5 miles)

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  • Average Low 2020–2025

    52.5 °F

  • Average 2020–2025

    60.9 °F

  • Average High 2020–2025

    69.3 °F
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