Potomac River - Calvert Bay Weather Forecast

    • 77
    • 92

    Chance Thunderstorms

    • 73
    • 88

    Rain Showers

    • 72
    • 85

    Chance Thunderstorms

    • 73
    • 85

    Partly Sunny

    • 77
    • 89

    Slight Chance Thunderstorms

    • 76
    • 92

    Chance Thunderstorms

Today 5 Jul St. Marys

Sunny, hot with Highs in the mid 90s. Southeast Winds 5 to 10 Mph.

Tonight 5 Jul St. Marys

Mostly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Lows in the mid 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming east after midnight. Chance of rain 50 percent.

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Potomac River - Calvert Bay Temperature Statistics

July Temperature

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.1 miles)

  • Lowest 1 July, 2026

    75 °F

  • Average July

    83.2 °F

  • Highest 2 July, 2026

    95 °F

Climate (2021–2026)

St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity (3.1 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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