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Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
19°F
-7°C
| Humidity | 62% |
| Wind Speed | Calm |
| Barometer | 30.14 in (1020.9 mb) |
| Dewpoint | 8°F (-13°C) |
| Visibility | 10.00 mi |
| Last update | 10 Feb 2:56 am EST |
Extended Forecast for
Port Jefferson NY
Overnight
Low: 18 °F
Mostly Cloudy
Tuesday
High: 35 °F
Mostly Cloudy
then Slight
Chance SnowTuesday Night
Low: 32 °F
Wintry Mix
Wednesday
High: 38 °F
Mostly Sunny
Wednesday Night
Low: 23 °F
Partly Cloudy
Thursday
High: 33 °F
Sunny
Thursday Night
Low: 19 °F
Mostly Cloudy
Friday
High: 33 °F
Sunny
Friday Night
Low: 23 °F
Mostly Cloudy
Detailed Forecast
Overnight
Mostly cloudy, with a low around 18. Calm wind.
Tuesday
A slight chance of snow between 1pm and 4pm. Mostly cloudy, with a high near 35. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
Tuesday Night
Rain, freezing rain, and sleet before 1am, then a chance of freezing rain and sleet between 1am and 4am. Steady temperature around 32. Wind chill values between 25 and 30. Light and variable wind becoming west around 6 mph after midnight. Chance of precipitation is 80%. Little or no ice accumulation expected. Little or no sleet accumulation expected.
Wednesday
Mostly sunny, with a high near 38. Wind chill values between 25 and 30. West wind 7 to 14 mph, with gusts as high as 25 mph.
Wednesday Night
Partly cloudy, with a low around 23. West wind around 10 mph, with gusts as high as 23 mph.
Thursday
Sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 19.
Friday
Sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 36.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Mostly cloudy, with a high near 37.
Sunday Night
Rain and snow likely. Cloudy, with a low around 29. Chance of precipitation is 60%.
Washington's Birthday
A 50 percent chance of rain. Cloudy, with a high near 39.
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)
2:28 am EST Feb 10, 2026
3am EST Feb 10, 2026-6pm EST Feb 16, 2026
Additional Resources
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Hourly Weather Forecast
