Below Normal Temperatures Continue

A strong cold front will sweep through the East on Wednesday with heavy wet snow from the eastern Great Lakes into northern New England and strong thunderstorms with damaging winds in the Mid-Atlantic and Northeast. The big story though will continue to be the well below average temperatures behind this storm system or east of the Rockies, as numerous record low temperatures are likely. Read More >

En Español

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

53°F

12°C

Humidity	83%
Wind Speed	S 9 G 21 mph
Barometer	29.88 in (1011.9 mb)
Dewpoint	48°F (9°C)
Visibility	10.00 mi
Wind Chill	50°F (10°C)
Last update	21 Apr 1:56 am EDT

More Information:

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

Extended Forecast for

Port Jefferson NY

Overnight

Mostly Clear
Low: 51 °F
Wednesday

Slight Chance
Showers then
Showers
Likely
High: 61 °F
Wednesday
Night

Showers then
Mostly Clear
and Breezy
Low: 35 °F
Thursday

Mostly Sunny
and Breezy
High: 52 °F
Thursday
Night

Partly Cloudy
and Breezy
Low: 40 °F
Friday

Sunny and
Breezy
High: 60 °F
Friday
Night

Mostly Clear
Low: 46 °F
Saturday

Mostly Sunny
High: 63 °F
Saturday
Night

Rain Likely
Low: 48 °F

Detailed Forecast

Overnight

Mostly clear, with a low around 51. South wind around 11 mph.

Wednesday

A chance of showers, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 61. South wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Showers and possibly a thunderstorm before 8pm, then a slight chance of showers between 8pm and 11pm. Low around 35. Wind chill values between 25 and 30. Breezy, with a west wind 18 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday

Mostly sunny, with a high near 52. Breezy, with a west wind 22 to 24 mph, with gusts as high as 36 mph.

Thursday Night

Partly cloudy, with a low around 40. Breezy, with a west wind around 21 mph, with gusts as high as 32 mph.

Friday

Sunny, with a high near 60. Breezy.

Friday Night

Mostly clear, with a low around 46.

Saturday

Mostly sunny, with a high near 63.

Saturday Night

Rain likely, mainly after 2am. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.