Potomac River - Calvert Bay Weather Forecast

    • 75
    • 87

    Mostly Sunny

    • 72
    • 87

    Rain Showers Likely

    • 71
    • 83

    Rain Showers

    • 72
    • 83

    Chance Rain Showers

    • 71
    • 85

    Chance Thunderstorms

    • 71
    • 84

    Mostly Sunny

Today 19 Aug St. Marys

Patchy fog this morning. Sunny. Highs in the upper 80s. Northwest Winds around 5 Mph.

Tonight 19 Aug St. Marys

Mostly clear. Lows in the lower 70s. South Winds around 5 Mph.

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  • Temperature Real-Time

Potomac River - Calvert Bay Temperature Statistics

August Temperature

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

  • Lowest 1 August, 2026

    69.1 °F

  • Average August

    80.1 °F

  • Highest 9 August, 2026

    91 °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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