Chesapeake Bay - Potomac River Entrance Weather Forecast

    • 82
    • 94

    Mostly Sunny

    • 79
    • 94

    Chance Thunderstorms

    • 79
    • 90

    Chance Thunderstorms

    • 78
    • 87

    Rain Showers Likely

    • 77
    • 86

    Chance Thunderstorms

    • 77
    • 86

    Slight Chance Thunderstorms

Today 3 Jul St. Marys

Sunny. Highs in the upper 90s. Northwest Winds around 5 Mph, becoming southwest around 5 Mph this afternoon. Heat index Values up to 113.

Tonight 3 Jul St. Marys

Mostly clear. A slight chance of Showers and Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds, frequent Lightning, and heavy rainfall in the evening. Lows around 80. Southwest Winds around 5 Mph, becoming west after midnight. Chance of rain 20 percent.

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Chesapeake Bay - Potomac River Entrance Temperature Statistics

July Temperature

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

  • Lowest 1 July, 2026

    75 °F

  • Average July

    81.7 °F

  • Highest 1 July, 2026

    91 °F

Climate (2021–2026)

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