Potomac River - Cornfield Harbor Weather Forecast

    • 73
    • 88

    Rain Showers

    • 72
    • 81

    Rain Showers

    • 73
    • 83

    Rain Showers Likely

    • 73
    • 84

    Chance Rain Showers

    • 73
    • 82

    Mostly Sunny

    • 75
    • 82

    Slight Chance Thunderstorms

Today 20 Aug St. Marys

Mostly sunny. Isolated Showers and Thunderstorms late this Morning, then Showers and numerous Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds and heavy rainfall this afternoon. Highs in the upper 80s. South Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 20 Aug St. Marys

Mostly cloudy. Numerous Showers and Thunderstorms in the Evening, then isolated Showers after midnight. Patchy fog. Some Thunderstorms may produce gusty Winds and heavy rainfall in the evening. Lows in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 70 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 1 August, 2026

    69.1 °F

  • Average August

    80.1 °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

    51.9 °F

  • Average 2021–2026

    60.4 °F

  • Average High 2021–2026

    68.7 °F
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