Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
27°F
-3°C
| Humidity | 51% |
| Wind Speed | NW 12 mph |
| Barometer | 30.05 in (1017.7 mb) |
| Dewpoint | 11°F (-12°C) |
| Visibility | 10.00 mi |
| Wind Chill | 16°F (-9°C) |
| Last update | 5 Feb 11:56 am EST |
Extended Forecast for
Port Jefferson NY
This Afternoon
High: 28 °F
Sunny
Tonight
Low: 20 °F
Partly Cloudy
Friday
High: 28 °F
Mostly Cloudy
Friday Night
Low: 25 °F
Slight Chance
Snow then
Snow LikelySaturday
High: 23 °F⇓
Windy. Snow
Likely then
Chance SnowSaturday Night
Low: 8 °F
Partly Cloudy
and Very
WindySunday
High: 18 °F
Cold and
WindySunday Night
Low: 12 °F
Mostly Clear
and Blustery
then Mostly
ClearMonday
High: 26 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Sunny, with a high near 28. Wind chill values between 15 and 20. Northwest wind around 7 mph.
Tonight
Partly cloudy, with a low around 20. Wind chill values between 10 and 15. North wind 6 to 8 mph.
Friday
Mostly cloudy, with a high near 28. Wind chill values between 10 and 20. Northeast wind 5 to 8 mph becoming light and variable in the afternoon.
Friday Night
Snow likely, mainly after 1am. Cloudy, with a steady temperature around 25. Wind chill values between 15 and 25. Southwest wind 3 to 8 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before noon, then a slight chance of snow showers after 1pm. Cloudy, with a temperature rising to near 23 by 10am, then falling to around 16 during the remainder of the day. Windy, with a northwest wind 18 to 23 mph increasing to 32 to 37 mph in the afternoon. Winds could gust as high as 55 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Saturday Night
Partly cloudy, with a low around 8. Very windy.
Sunday
Sunny and cold, with a high near 18. Windy.
Sunday Night
Mostly clear, with a low around 12. Blustery.
Monday
Mostly sunny, with a high near 26.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 31.
Tuesday Night
Mostly cloudy, with a low around 23.
Wednesday
Mostly cloudy, with a high near 33.
Additional Forecasts and Information
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Forecast AreaABOUT 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)
1:31 am EST Feb 5, 2026
12pm EST Feb 5, 2026-6pm EST Feb 11, 2026
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