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

June weather forecast and climate
Port Jefferson, NY

Ocean temperature

In Port Jefferson, New York, the average seawater temperature in Junio is 64.6°F (18.1°C).
Note: For swimming, a surface water temperature of 64.6°F (18.1°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

With an average of 15.1h of daylight, Junio has the longest days of the year in Port Jefferson, New York.

How cold is the water in Junio in Port Jefferson?

In Port Jefferson, the average seawater temperature in Junio is 64.6°F (18.1°C). Swimming in 64.6°F (18.1°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

When are the longest days in Port Jefferson?

Junio has the longest days of the year in Port Jefferson, with an average of 15.1h of daylight.

What is the average length of the day in Junio in Port Jefferson?

The average length of the day in Junio is 15.1h.
Average sea temperature in June - Port Jefferson, NY
  • Average sea temperature in June: 64.6°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 June - Port Jefferson, NY
  • Average daylight in June: 15.1h

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