Chesapeake Bay - Flag Harbor Weather Forecast

    • 73
    • 83

    Chance Rain Showers

    • 65
    • 78

    Mostly Sunny

    • 67
    • 77

    Mostly Sunny

    • 69
    • 79

    Mostly Sunny

    • 71
    • 81

    Mostly Sunny

    • 71
    • 83

    Slight Chance Rain Showers

Today 13 Sep Calvert

Mostly cloudy this Morning, then becoming mostly sunny. Scattered Showers this Morning, then isolated Showers and Thunderstorms this afternoon. Highs in the mid 80s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 13 Sep Calvert

Partly cloudy in the Evening, then becoming mostly clear. Lows in the upper 60s. South Winds around 5 Mph, becoming west after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Chesapeake Bay - Flag Harbor Temperature Statistics

September Temperature

St Marys County Airport (10.6 miles)

  • Lowest 8 September, 2026

    59.5 °F

  • Average September

    76.3 °F

  • Highest 1 September, 2026

    93.9 °F

Climate (2021–2026)

St Marys County Airport (10.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    49.5 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    67 °F
Get WillyWeather+ to remove ads