Potomac River - Calvert Bay Weather Forecast

    • 70
    • 86

    Sunny

    • 70
    • 88

    Mostly Sunny

    • 61
    • 90

    Rain Showers Likely

    • 56
    • 69

    Rain Showers Likely

    • 59
    • 65

    Rain Showers Likely

    • 63
    • 75

    Rain Showers Likely

Today 18 May St. Marys

Sunny, hot with Highs in the lower 90s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 18 May St. Marys

Mostly clear. Lows in the lower 70s. South Winds 5 to 10 Mph.

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Potomac River - Calvert Bay Temperature Statistics

May Temperature

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

  • Lowest 11 May, 2026

    45 °F

  • Average May

    61.2 °F

  • Highest 16 May, 2026

    84 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    52 °F

  • Average 2021–2026

    60.4 °F

  • Average High 2021–2026

    68.8 °F
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