News Headlines
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Overcast
43°F
6°C
| Humidity | 89% |
| Wind Speed | SE 13 mph |
| Barometer | 29.98 in (1015.4 mb) |
| Dewpoint | 40°F (4°C) |
| Visibility | 9.00 mi |
| Wind Chill | 36°F (2°C) |
| Last update | 22 Mar 1:56 am EDT |
Extended Forecast for
Port Jefferson NY
Overnight

Low: 39 °F
Mostly Cloudy
Sunday

High: 57 °F
Chance
ShowersSunday Night

Low: 39 °F
Rain
Monday

High: 45 °F
Chance Rain
Monday Night

Low: 31 °F
Mostly Clear
Tuesday

High: 45 °F
Sunny
Tuesday Night

Low: 34 °F
Mostly Cloudy
Wednesday

High: 50 °F
Partly Sunny
Wednesday Night

Low: 35 °F
Mostly Cloudy
Detailed Forecast
Overnight
Mostly cloudy, with a low around 39. Southeast wind around 5 mph.
Sunday
A slight chance of showers before 11am, then a chance of showers after 5pm. Mostly cloudy, with a high near 57. South wind 7 to 10 mph. Chance of precipitation is 30%.
Sunday Night
Rain. Low around 39. Light and variable wind becoming north around 6 mph in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A 40 percent chance of rain before 2pm. Cloudy, with a high near 45. North wind around 10 mph.
Monday Night
Mostly clear, with a low around 31. Northwest wind around 9 mph.
Tuesday
Sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 50.
Wednesday Night
Mostly cloudy, with a low around 35.
Thursday
A chance of rain between 8am and 2pm. Partly sunny, with a high near 50. Chance of precipitation is 30%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 49.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Mostly sunny, with a high near 43.
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)
3:03 pm EDT Mar 21, 2026
2am EDT Mar 22, 2026-6pm EDT Mar 28, 2026


