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

September weather forecast and climate
Chelsea, MA

Ocean temperature

In Chelsea, Massachusetts, the average seawater temperature in September is 64.8°F (18.2°C).
Note: For swimming, a surface water temperature of 64.8°F (18.2°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

In Chelsea, the average length of the day in September is 12.5h.

What is the ocean temperature in September in Chelsea?

In Chelsea, Massachusetts, the average seawater temperature in September is 64.8°F (18.2°C). Swimming in 64.8°F (18.2°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

In Chelsea, the average length of the day in September is 12.5h.
Average sea temperature in September - Chelsea, MA
  • Average sea temperature in September: 64.8°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 September - Chelsea, MA
  • Average daylight in September: 12.5h

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