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

August weather forecast and climate
Chelsea, MA

Ocean temperature

The month with the warmest seawater in Chelsea, Massachusetts, is August, with an average ocean temperature of 68°F (20°C).
Note: For swimming, a surface water temperature of 68°F (20°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in August is 13.8h.

When is the ocean warmest in Chelsea?

August is the month with the warmest seawater in Chelsea, with an average ocean temperature of 68°F (20°C).

What is the ocean temperature in August in Chelsea?

In Chelsea, the average seawater temperature in August is 68°F (20°C). For most, swimming in 68°F (20°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In Chelsea, Massachusetts, the average length of the day in August is 13.8h.
Average sea temperature in August - Chelsea, MA
  • Average sea temperature in August: 67.9°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 August - Chelsea, MA
  • Average daylight in August: 13.8h

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