Potomac River - Cornfield Harbor Weather Forecast

    • 76
    • 82

    Rain Showers

    • 73
    • 83

    Becoming Sunny

    • 74
    • 80

    Partly Sunny

    • 74
    • 82

    Chance Rain Showers

    • 72
    • 79

    Rain Showers Likely

    • 67
    • 73

    Rain Showers Likely

    • 65
    • 67

    Chance Rain Showers

Today 17 Sep St. Marys

Partly sunny with a 30 percent chance of Showers. Highs in the upper 60s.

Tonight 17 Sep St. Marys

Partly cloudy. Lows in the lower 70s. Southwest Winds around 5 Mph.

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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 15 September, 2026

    60.1 °F

  • Average September

    76.8 °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

    68.6 °F
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