Potomac River - St Marys River Entrance Weather Forecast

    • 74
    • 83

    Thunderstorms

    • 73
    • 86

    Chance Thunderstorms

    • 72
    • 85

    Chance Rain Showers

    • 70
    • 83

    Mostly Sunny

    • 72
    • 86

    Mostly Sunny

    • 71
    • 85

    Slight Chance Thunderstorms

    • 70
    • 84

    Slight Chance Thunderstorms

Today 13 Aug St. Marys

Mostly cloudy with scattered Showers with isolated Thunderstorms. Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 13 Aug St. Marys

Mostly cloudy this Evening, then becoming partly cloudy. Scattered Showers. Scattered Thunderstorms, mainly this evening. Lows in the lower 70s. Southwest Winds around 5 Mph. Chance of rain 50 percent.

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Potomac River - St Marys River Entrance Temperature Statistics

August Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (1.9 miles)

  • Lowest 4 August, 2025

    58.6 °F

  • Average August

    71.9 °F

  • Highest 11 August, 2025

    82.9 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (1.9 miles)

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  • Average Low 2020–2025

    52.4 °F

  • Average 2020–2025

    60.8 °F

  • Average High 2020–2025

    69.2 °F
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