News Headlines
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
31°F
-1°C
| Humidity | 38% |
| Wind Speed | W 8 mph |
| Barometer | 30.12 in (1020.1 mb) |
| Dewpoint | 8°F (-13°C) |
| Visibility | 10.00 mi |
| Wind Chill | 24°F (-4°C) |
| Last update | 3 Feb 1:56 pm EST |
Extended Forecast for
Port Jefferson NY
This Afternoon
High: 32 °F
Partly Sunny
Tonight
Low: 17 °F
Mostly Cloudy
Wednesday
High: 31 °F
Sunny
Wednesday Night
Low: 15 °F
Partly Cloudy
Thursday
High: 29 °F
Sunny
Thursday Night
Low: 13 °F
Partly Cloudy
Friday
High: 27 °F
Partly Sunny
Friday Night
Low: 12 °F
Chance Snow
Saturday
High: 20 °F
Cold and
Blustery
Detailed Forecast
This Afternoon
Partly sunny, with a high near 32. Wind chill values between 25 and 30. West wind around 7 mph.
Tonight
Mostly cloudy, with a low around 17. Wind chill values between 10 and 15. Southwest wind 3 to 5 mph.
Wednesday
Sunny, with a high near 31. Wind chill values between 10 and 20. Northwest wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 15. Calm wind becoming northwest around 5 mph after midnight.
Thursday
Sunny, with a high near 29. Northwest wind around 7 mph.
Thursday Night
Partly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 27.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 12.
Saturday
Mostly sunny and cold, with a high near 20. Blustery.
Saturday Night
Mostly clear, with a low around 5. Blustery.
Sunday
Mostly sunny and cold, with a high near 18.
Sunday Night
Partly cloudy, with a low around 5.
Monday
Mostly sunny, with a high near 21.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT 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)
12:54 pm EST Feb 3, 2026
2pm EST Feb 3, 2026-6pm EST Feb 9, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
