Potomac River - Cornfield Harbor Weather Forecast

    • 75
    • 84

    Becoming Sunny

    • 75
    • 84

    Mostly Sunny

    • 76
    • 84

    Mostly Cloudy

    • 75
    • 83

    Rain Showers Likely

    • 75
    • 83

    Chance Thunderstorms

    • 75
    • 83

    Chance Rain Showers

Today 30 Jul St. Marys

Sunny. Highs in the mid 80s. Northwest Winds 5 to 10 Mph.

Tonight 30 Jul St. Marys

Partly cloudy in the Evening, then clearing. Lows in the upper 60s. Northwest Winds 5 to 10 Mph.

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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 24 July, 2026

    63 °F

  • Average July

    79.4 °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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