Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
26°F
-3°C
| Humidity | 51% |
| Wind Speed | Calm |
| Barometer | 30.20 in (1022.8 mb) |
| Dewpoint | 10°F (-12°C) |
| Visibility | 10.00 mi |
| Last update | 4 Feb 6:56 pm EST |
Extended Forecast for
Port Jefferson NY
Tonight

Low: 18 °F
Decreasing
CloudsThursday

High: 30 °F
Sunny
Thursday Night

Low: 18 °F
Partly Cloudy
Friday

High: 27 °F
Mostly Cloudy
Friday Night
Low: 18 °F
Chance Light
Snow then
Light Snow
LikelySaturday

High: 22 °F⇓
Snow Likely
and WindySaturday Night

Low: 8 °F
Partly Cloudy
and WindySunday

High: 18 °F
Cold and
BlusterySunday Night

Low: 12 °F
Mostly Clear
Detailed Forecast
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 18. Wind chill values between 10 and 15. North wind around 6 mph.
Thursday
Sunny, with a high near 30. Wind chill values between 10 and 20. North wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 18. Wind chill values between 10 and 15. North wind 5 to 7 mph.
Friday
Mostly cloudy, with a high near 27. Wind chill values between 10 and 20. Northeast wind around 6 mph becoming light and variable in the afternoon.
Friday Night
Light snow likely, mainly after 1am. Cloudy, with a low around 18. Light southwest wind becoming west 8 to 13 mph in the evening. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before 1pm. Mostly cloudy, with a temperature falling to around 15 by 5pm. Windy. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a low around 8. Windy.
Sunday
Sunny and cold, with a high near 18. Blustery.
Sunday Night
Mostly clear, with a low around 12.
Monday
Mostly sunny, with a high near 26.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Partly sunny, with a high near 31.
Tuesday Night
Mostly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 33.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
ABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.96°N 73.08°W (Elev. 3 ft)
40.96°N 73.08°W (Elev. 3 ft)
1:52 pm EST Feb 4, 2026
7pm EST Feb 4, 2026-6pm EST Feb 11, 2026



