Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Partly Cloudy
28°F
-2°C
| Humidity | 43% |
| Wind Speed | W 14 mph |
| Barometer | 29.88 in (1011.8 mb) |
| Dewpoint | 8°F (-13°C) |
| Visibility | 10.00 mi |
| Wind Chill | 17°F (-8°C) |
| Last update | 24 Feb 4:56 pm EST |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 17 °F
Partly Cloudy
then Snow
LikelyWednesday
High: 39 °F
Rain/Snow and
Breezy then
Chance
Rain/SnowWednesday Night
Low: 29 °F
Partly Cloudy
Thursday
High: 36 °F
Mostly Sunny
then Chance
SnowThursday Night
Low: 25 °F
Chance Snow
Friday
High: 35 °F
Mostly Sunny
Friday Night
Low: 31 °F
Partly Cloudy
Saturday
High: 41 °F
Mostly Sunny
Saturday Night
Low: 32 °F
Partly Cloudy
Detailed Forecast
Tonight
Snow likely after 4am. Increasing clouds, with a low around 17. Wind chill values between 10 and 15. West wind 8 to 13 mph becoming light and variable. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.
Wednesday
Snow, mixing with rain after 9am, then gradually ending. High near 39. Wind chill values between 20 and 30. Breezy, with a southwest wind 14 to 20 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Wednesday Night
Partly cloudy, with a low around 29. Southwest wind around 14 mph.
Thursday
A 30 percent chance of snow, mainly after 4pm. Partly sunny, with a high near 36. Wind chill values between 20 and 30. West wind 7 to 10 mph.
Thursday Night
A 40 percent chance of snow, mainly before 4am. Mostly cloudy, with a low around 25. West wind 6 to 9 mph becoming north after midnight.
Friday
Mostly sunny, with a high near 35.
Friday Night
Partly cloudy, with a low around 31.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 22.
Monday
A 40 percent chance of snow. Partly sunny, with a high near 29.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 24.
Tuesday
A 30 percent chance of snow. Partly sunny, with a high near 34.
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)
4:55 pm EST Feb 24, 2026
5pm EST Feb 24, 2026-6pm EST Mar 3, 2026
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