News Headlines
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Light Rain Fog/Mist
49°F
9°C
| Humidity | 97% |
| Wind Speed | NE 7 mph |
| Barometer | 29.73 in (1006.7 mb) |
| Dewpoint | 48°F (9°C) |
| Visibility | 4.00 mi |
| Wind Chill | 46°F (8°C) |
| Last update | 22 Mar 10:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight

Low: 38 °F
Rain
Monday
High: 45 °F
Rain then
Partly SunnyMonday Night

Low: 31 °F
Partly Cloudy
Tuesday

High: 45 °F
Sunny
Tuesday Night

Low: 34 °F
Increasing
CloudsWednesday

High: 49 °F
Partly Sunny
Wednesday Night

Low: 38 °F
Mostly Cloudy
Thursday

High: 52 °F
Mostly Cloudy
Thursday Night

Low: 42 °F
Rain Likely
Detailed Forecast
Tonight
Rain. Low around 38. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain, mainly before 11am. High near 45. North wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Partly cloudy, with a low around 31. Wind chill values between 25 and 30. Northwest wind 8 to 10 mph.
Tuesday
Sunny, with a high near 45. Wind chill values between 25 and 35 early. North wind 6 to 8 mph becoming southwest in the afternoon.
Tuesday Night
Increasing clouds, with a low around 34. Southwest wind around 7 mph.
Wednesday
Partly sunny, with a high near 49.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
Mostly cloudy, with a high near 52.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Mostly sunny, with a high near 47.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
ABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.93°N 73.06°W (Elev. 161 ft)
40.93°N 73.06°W (Elev. 161 ft)
3:49 pm EDT Mar 22, 2026
11pm EDT Mar 22, 2026-6pm EDT Mar 29, 2026


