Potomac River - Cornfield Harbor Weather Forecast

    • 77
    • 85

    Rain Showers

    • 78
    • 88

    Chance Rain Showers

    • 76
    • 84

    Rain Showers Likely

    • 74
    • 82

    Partly Sunny

    • 74
    • 81

    Slight Chance Thunderstorms

    • 75
    • 85

    Mostly Sunny

Today 9 Jul St. Marys

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Morning, then partly sunny with Thunderstorms likely with a chance of Showers in the afternoon. Highs in the upper 80s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 9 Jul St. Marys

Mostly cloudy with isolated Showers and Thunderstorms. Lows in the lower 70s. South Winds around 5 Mph. Chance of rain 20 percent.

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Potomac River - Cornfield Harbor Temperature Statistics

July Temperature

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

  • Lowest 5 July, 2026

    73.9 °F

  • Average July

    84.7 °F

  • Highest 3 July, 2026

    98.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    51.9 °F

  • Average 2021–2026

    60.4 °F

  • Average High 2021–2026

    68.7 °F
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