Port Jefferson
New York, USA
Long-term weather forecast
Long-term weather forecast

March weather forecast and climate
Port Jefferson, NY

Ocean temperature

In Marzo, the average ocean temperature in Port Jefferson, New York, is 40.5°F (4.7°C).
Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

Daylight

In Marzo, the average length of the day is 12h.

How cold is the water in Marzo in Port Jefferson?

In Marzo, the average ocean temperature is 40.5°F (4.7°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

How many hours of daylight does Port Jefferson have in Marzo?

In Port Jefferson, New York, the average length of the day in Marzo is 12h.
Average sea temperature in March - Port Jefferson, NY
  • Average sea temperature in March: 40.4°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in March - Port Jefferson, NY
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).