National Weather Service

News Headlines

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

66°F

19°C

Humidity	87%
Wind Speed	SW 5 mph
Barometer	30.03 in (1016.7 mb)
Dewpoint	62°F (17°C)
Visibility	10.00 mi
Last update	13 Jun 6:56 am EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Port Jefferson NY

Today
High: 81 °F
Patchy Fog
then Sunny
Tonight
Low: 66 °F
Mostly Clear
Friday
High: 82 °F
Mostly Sunny
then Showers
Likely
Friday Night
Low: 62 °F
Showers
Saturday
High: 80 °F
Sunny
Saturday Night
Low: 59 °F
Mostly Clear
Sunday
High: 77 °F
Sunny
Sunday Night
Low: 61 °F
Partly Cloudy
Monday
High: 81 °F
Mostly Sunny

Detailed Forecast

Today

Patchy fog before 8am. Otherwise, sunny, with a high near 81. Light southwest wind becoming south 10 to 15 mph in the morning.

Tonight

Mostly clear, with a low around 66. South wind 11 to 13 mph.

Friday

A chance of showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 82. Southwest wind 11 to 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

Showers and possibly a thunderstorm before 2am, then a slight chance of showers. Low around 62. South wind 5 to 8 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday

Sunny, with a high near 80. North wind around 10 mph.

Saturday Night

Mostly clear, with a low around 59.

Sunday

Sunny, with a high near 77.

Sunday Night

Partly cloudy, with a low around 61.

Monday

Mostly sunny, with a high near 81.

Monday Night

Partly cloudy, with a low around 66.