Potomac River - Cornfield Harbor Weather Forecast

    • 66
    • 83

    Rain Showers

    • 58
    • 71

    Rain Showers

    • 57
    • 63

    Rain Showers

    • 59
    • 68

    Rain Showers

    • 65
    • 71

    Chance Rain Showers

    • 65
    • 74

    Rain Showers Likely

    • 65
    • 73

    Chance Rain Showers

Today 20 May St. Marys

Sunny with isolated Showers and Thunderstorms. Some Thunderstorms may be severe with damaging Winds and frequent lightning. Hot with Highs in the mid 90s. South Winds around 10 Mph. Chance of rain 20 percent.

Tonight 20 May St. Marys

Mostly cloudy. A chance of Showers and Thunderstorms this Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. East Winds 5 to 10 Mph, becoming northeast after midnight. Chance of rain 50 percent.

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Potomac River - Cornfield Harbor Temperature Statistics

May Temperature

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

  • Lowest 11 May, 2026

    45 °F

  • Average May

    62.8 °F

  • Highest 18 May, 2026

    90 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    52 °F

  • Average 2021–2026

    60.4 °F

  • Average High 2021–2026

    68.8 °F
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