Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
A Few Clouds
39°F
4°C
| Humidity | 38% |
| Wind Speed | NW 14 mph |
| Barometer | 30.38 in (1028.9 mb) |
| Dewpoint | 15°F (-9°C) |
| Visibility | 10.00 mi |
| Wind Chill | 31°F (-1°C) |
| Last update | 7 Apr 8:56 pm EDT |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 28 °F
Clear and
BlusteryWednesday
High: 45 °F
Sunny
Wednesday Night
Low: 34 °F
Mostly Clear
Thursday
High: 49 °F
Sunny
Thursday Night
Low: 40 °F
Partly Cloudy
Friday
High: 56 °F
Sunny
Friday Night
Low: 45 °F
Mostly Cloudy
Saturday
High: 59 °F
Sunny
Saturday Night
Low: 40 °F
Clear
Detailed Forecast
Tonight
Clear, with a low around 28. Wind chill values between 20 and 25. Blustery, with a north wind 14 to 23 mph.
Wednesday
Sunny, with a high near 45. Wind chill values between 20 and 30 early. East wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 34. South wind 5 to 7 mph becoming calm after midnight.
Thursday
Sunny, with a high near 49. Southeast wind 5 to 8 mph.
Thursday Night
Partly cloudy, with a low around 40. South wind 3 to 7 mph.
Friday
Sunny, with a high near 56.
Friday Night
Mostly cloudy, with a low around 45.
Saturday
Sunny, with a high near 59.
Saturday Night
Clear, with a low around 40.
Sunday
Sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 66.
Monday Night
Mostly cloudy, with a low around 53.
Tuesday
Partly sunny, with a high near 70.
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)
6:49 pm EDT Apr 7, 2026
9pm EDT Apr 7, 2026-6pm EDT Apr 14, 2026
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