Potomac River - Cornfield Harbor Weather Forecast

    • 75
    • 85

    Slight Chance Thunderstorms

    • 75
    • 84

    Rain Showers Likely

    • 75
    • 83

    Partly Sunny

    • 77
    • 85

    Mostly Sunny

    • 78
    • 87

    Mostly Sunny

    • 79
    • 87

    Mostly Sunny

Today 27 Aug St. Marys

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 27 Aug St. Marys

Mostly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Lows in the lower 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming southwest after midnight. Chance of rain 30 percent.

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Potomac River - Cornfield Harbor Temperature Statistics

August Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (6.8 miles)

  • Lowest 24 August, 2026

    62.1 °F

  • Average August

    78.5 °F

  • Highest 9 August, 2026

    91 °F

Climate (2021–2026)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (6.8 miles)

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  • Average Low 2021–2026

    51.8 °F

  • Average 2021–2026

    60.3 °F

  • Average High 2021–2026

    68.7 °F
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