Potomac River - Cornfield Harbor Weather Forecast

    • 80
    • 90

    Thunderstorms

    • 77
    • 89

    Rain Showers Likely

    • 73
    • 82

    Chance Rain Showers

    • 70
    • 80

    Mostly Sunny

    • 71
    • 80

    Mostly Sunny

    • 72
    • 83

    Partly Sunny

Today 3 Sep St. Marys

Partly sunny with isolated Showers and Thunderstorms. Highs in the lower 90s. Southwest Winds around 5 Mph. Chance of rain 20 percent.

Tonight 3 Sep St. Marys

Mostly cloudy with scattered Showers with isolated Thunderstorms. Lows in the mid 70s. Southwest Winds around 5 Mph. Chance of rain 40 percent.

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Potomac River - Cornfield Harbor Temperature Statistics

September Temperature

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

  • Lowest 1 September, 2026

    75 °F

  • Average September

    82.5 °F

  • Highest 1 September, 2026

    91.9 °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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