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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Partly Cloudy
42°F
6°C
| Humidity | 62% |
| Wind Speed | Calm |
| Barometer | 30.12 in (1019.9 mb) |
| Dewpoint | 30°F (-1°C) |
| Visibility | 10.00 mi |
| Last update | 7 Dec 9:56 am EST |
Extended Forecast for
Port Jefferson NY
Today

High: 42 °F
Partly Sunny
Tonight

Low: 25 °F
Partly Cloudy
Monday
High: 31 °F
Sunny and
Blustery then
Partly SunnyMonday Night

Low: 18 °F
Partly Cloudy
Tuesday

High: 39 °F
Increasing
CloudsTuesday Night

Low: 36 °F
Mostly Cloudy
Wednesday

High: 47 °F
Chance Rain
Wednesday Night

Low: 36 °F
Chance Rain
Thursday

High: 43 °F
Mostly Sunny
Detailed Forecast
Today
Partly sunny, with a high near 42. North wind around 6 mph becoming southwest in the afternoon.
Tonight
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. Southwest wind 8 to 18 mph becoming northwest after midnight.
Monday
Mostly sunny, with a high near 31. Wind chill values between 10 and 20. Blustery, with a north wind 13 to 21 mph.
Monday Night
Partly cloudy, with a low around 18. Wind chill values between 10 and 15. North wind 6 to 11 mph.
Tuesday
Increasing clouds, with a high near 39. Light and variable wind becoming south 5 to 10 mph in the morning.
Tuesday Night
Mostly cloudy, with a steady temperature around 36.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 47.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 36.
Thursday
Mostly sunny, with a high near 43.
Thursday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 40%.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 40%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 33.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.95°N 73.05°W (Elev. 151 ft)
40.95°N 73.05°W (Elev. 151 ft)
7:42 am EST Dec 7, 2025
10am EST Dec 7, 2025-6pm EST Dec 13, 2025


