Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
35°F
2°C
| Humidity | 70% |
| Wind Speed | Calm |
| Barometer | 29.90 in (1012.5 mb) |
| Dewpoint | 26°F (-3°C) |
| Visibility | 10.00 mi |
| Last update | 26 Feb 8:56 pm EST |
Extended Forecast for
Port Jefferson NY
Tonight
Low: 23 °F
Decreasing
CloudsFriday
High: 37 °F
Sunny
Friday Night
Low: 29 °F
Mostly Clear
Saturday
High: 43 °F
Mostly Sunny
Saturday Night
Low: 28 °F
Partly Cloudy
Sunday
High: 36 °F
Partly Sunny
Sunday Night
Low: 17 °F
Partly Cloudy
Monday
High: 28 °F
Mostly Sunny
then Chance
SnowMonday Night
Low: 20 °F
Partly Cloudy
Detailed Forecast
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 23. Light and variable wind.
Friday
Sunny, with a high near 37. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 29. Light south wind.
Saturday
Mostly sunny, with a high near 43. South wind 3 to 6 mph.
Saturday Night
Partly cloudy, with a low around 28. Calm wind becoming north around 5 mph after midnight.
Sunday
Partly sunny, with a high near 36.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
Partly sunny, with a high near 35.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 29.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 42.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Port Jefferson NY
40.93°N 73.06°W (Elev. 161 ft)
40.93°N 73.06°W (Elev. 161 ft)
9:33 pm EST Feb 26, 2026
9pm EST Feb 26, 2026-6pm EST Mar 5, 2026
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