Chesapeake Bay - Flag Harbor Weather Forecast

    • 41
    • 49

    Mostly Cloudy

    • 43
    • 51

    Mostly Cloudy

    • 54
    • 62

    Rain Showers Likely

    • 48
    • 68

    Rain Showers

    • 41
    • 55

    Mostly Sunny

    • 49
    • 61

    Mostly Sunny

    • 51
    • 67

    Partly Sunny

Today 13 Mar Calvert

Partly sunny. Highs in the lower 50s. Northeast Winds 5 to 10 Mph.

Tonight 13 Mar Calvert

Mostly cloudy. Patchy fog after midnight. Lows around 40. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chesapeake Bay - Flag Harbor Temperature Statistics

March Temperature

St Marys County Airport (10.6 miles)

  • Lowest 3 March, 2025

    21.2 °F
  • Average March

    44.2 °F
  • Highest 1 March, 2025

    68 °F

Climate (2020–Present)

St Marys County Airport (10.6 miles)

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  • Average Low 2020–2025

    49.4 °F
  • Average 2020–2025

    57.8 °F
  • Average High 2020–2025

    66.5 °F
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