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

January weather forecast and climate
Port Jefferson, NY

Ocean temperature

In Port Jefferson, New York, the average seawater temperature in Enero is 42.3°F (5.7°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 Enero is 9.6h.

How cold is the water in Enero in Port Jefferson?

In Enero, the average ocean temperature in Port Jefferson, New York, is 42.3°F (5.7°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 Enero in Port Jefferson?

In Port Jefferson, the average length of the day in Enero is 9.6h.
Average sea temperature in January - Port Jefferson, NY
  • Average sea temperature in January: 42.3°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 January - Port Jefferson, NY
  • Average daylight in January: 9.6h

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