Chesapeake Bay - Flag Harbor Weather Forecast
- 62
- 73
Sunny
- 64
- 75
Partly Sunny
- 63
- 72
Mostly Cloudy
- 65
- 78
Mostly Sunny
- 63
- 77
Mostly Sunny
- 63
- 75
Mostly Sunny
Today 8 Sep Calvert
Sunny. Highs in the mid 70s. Northeast Winds 5 to 10 Mph.
Tonight 8 Sep Calvert
Clear. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.
Chesapeake Bay - Flag Harbor Temperature Statistics
September Temperature
St Marys County Airport (10.6 miles)
Lowest 3 September, 2025
53.2 °FAverage September
69.7 °FHighest 4 September, 2025
86.9 °F
Climate (2020–Present)
St Marys County Airport (10.6 miles)
Average Low 2020–2025
49.7 °FAverage 2020–2025
58.1 °FAverage High 2020–2025
66.8 °F