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

May weather forecast and climate
Charlestown, MD

Ocean temperature

In Charlestown, Maryland, the average seawater temperature in May is 54°F (12.2°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in May in Charlestown is 14.4h.

How cold is the water in May in Charlestown?

In Charlestown, Maryland, the average seawater temperature in May is 54°F (12.2°C). Swimming in 54°F (12.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Charlestown have in May?

The average length of the day in May in Charlestown is 14.4h.
Average sea temperature in May - Charlestown, MD
  • Average sea temperature in May: 53.9°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 May - Charlestown, MD
  • Average daylight in May: 14.4h

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