Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Chelsea, MA

Ocean temperature

In Chelsea, Massachusetts, in April, the average water temperature is 43.2°F (6.2°C).
Note: Swimming in 43.2°F (6.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.


In April, the average length of the day in Chelsea is 13.4h.

What is the water temperature in April in Chelsea?

In Chelsea, Massachusetts, the average seawater temperature in April is 43.2°F (6.2°C). 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.

What is the average length of the day in April in Chelsea?

The average length of the day in April in Chelsea is 13.4h.
Average sea temperature in April - Chelsea, MA
  • Average sea temperature in April: 43.1°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

Average daylight in April - Chelsea, MA
  • Average daylight in April: 13.4h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).