Chesapeake Bay - Potomac River Entrance Weather Forecast

    • 68
    • 77

    Becoming Sunny

    • 69
    • 80

    Sunny

    • 69
    • 76

    Partly Sunny

    • 68
    • 74

    Slight Chance Thunderstorms

    • 69
    • 74

    Partly Sunny

    • 70
    • 78

    Partly Sunny

Today 18 Sep St. Marys

Patchy fog this morning. Partly sunny. Highs in the upper 70s. Northwest Winds around 5 Mph.

Tonight 18 Sep St. Marys

Clear. Lows in the lower 60s. Southwest Winds around 5 Mph.

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Chesapeake Bay - Potomac River Entrance Temperature Statistics

September Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (9.3 miles)

  • Lowest 1 September, 2025

    55 °F

  • Average September

    69.4 °F

  • Highest 6 September, 2025

    89.1 °F

Climate (2020–Present)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (9.3 miles)

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  • Average Low 2020–2025

    52.3 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    69.2 °F
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