Charlestown
Maryland, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Charlestown, MD

Ocean temperature

In Charlestown, Maryland, in September, the average water temperature is 72.1°F (22.3°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.1°F (22.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In September, the average length of the day is 12.4h.

How warm is the water in September in Charlestown?

In Charlestown, the average seawater temperature in September is 72.1°F (22.3°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.1°F (22.3°C) water.

What is the average length of the day in September in Charlestown?

In September, the average length of the day is 12.4h.
Average sea temperature in September - Charlestown, MD
  • Average sea temperature in September: 72.1°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

Average daylight in September - Charlestown, MD
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.4h).