Chesapeake Bay - Flag Harbor Weather Forecast

    • 67
    • 76

    Chance Rain Showers

    • 69
    • 82

    Chance Thunderstorms

    • 67
    • 84

    Chance Thunderstorms

    • 61
    • 77

    Mostly Sunny

    • 57
    • 74

    Mostly Sunny

    • 59
    • 71

    Partly Sunny

Today 15 May Calvert

Patchy fog this morning. Cloudy with scattered Showers this Morning, then partly sunny with isolated Showers and Thunderstorms this afternoon. Highs in the upper 70s. Southwest Winds around 5 Mph. Chance of rain 50 percent.

Tonight 15 May Calvert

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the mid 60s. South Winds around 5 Mph. Chance of rain 40 percent.

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Chesapeake Bay - Flag Harbor Temperature Statistics

May Temperature

St Marys County Airport (10.6 miles)

  • Lowest 10 May, 2025

    44.6 °F

  • Average May

    66.5 °F

  • Highest 2 May, 2025

    86 °F

Climate (2020–Present)

St Marys County Airport (10.6 miles)

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  • Average Low 2020–2025

    49.5 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    66.6 °F
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