Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
40°F
4°C
| Humidity | 55% |
| Wind Speed | W 16 G 30 mph |
| Barometer | 29.70 in (1005.8 mb) |
| Dewpoint | 25°F (-4°C) |
| Visibility | 10.00 mi |
| Wind Chill | 32°F (0°C) |
| Last update | 11 Feb 11:56 am EST |
Extended Forecast for
Port Jefferson NY
This Afternoon
High: 37 °F
Mostly Sunny
Tonight
Low: 24 °F
Partly Cloudy
Thursday
High: 33 °F
Sunny
Thursday Night
Low: 19 °F
Partly Cloudy
Friday
High: 33 °F
Sunny
Friday Night
Low: 28 °F
Increasing
CloudsSaturday
High: 37 °F
Mostly Sunny
Saturday Night
Low: 23 °F
Mostly Clear
Sunday
High: 36 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Mostly sunny, with a high near 37. West wind around 15 mph, with gusts as high as 26 mph.
Tonight
Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind around 14 mph.
Thursday
Sunny, with a high near 33. Wind chill values between 15 and 25. Northwest wind 10 to 14 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 19. Northwest wind around 7 mph.
Friday
Sunny, with a high near 33. Northwest wind 6 to 9 mph.
Friday Night
Increasing clouds, with a steady temperature around 28.
Saturday
Mostly sunny, with a high near 37.
Saturday Night
Mostly clear, with a low around 23.
Sunday
Mostly sunny, with a high near 36.
Sunday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28.
Washington's Birthday
A 30 percent chance of rain. Partly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 41.
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)
1:42 am EST Feb 11, 2026
12pm EST Feb 11, 2026-6pm EST Feb 17, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
