Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Overcast
29°F
-2°C
| Humidity | 72% |
| Wind Speed | E 5 mph |
| Barometer | 30.58 in (1035.6 mb) |
| Dewpoint | 21°F (-6°C) |
| Visibility | 10.00 mi |
| Wind Chill | 24°F (-4°C) |
| Last update | 3 Mar 6:56 am EST |
Extended Forecast for
Port Jefferson NY
Today
High: 38 °F
Rain/Snow
then RainTonight
Low: 36 °F
Rain
Wednesday
High: 42 °F
Partly Sunny
Wednesday Night
Low: 36 °F
Mostly Cloudy
then Slight
Chance RainThursday
High: 41 °F
Rain Likely
Thursday Night
Low: 38 °F
Rain Likely
Friday
High: 41 °F
Chance Rain
Friday Night
Low: 37 °F
Cloudy
Saturday
High: 49 °F
Cloudy
Detailed Forecast
Today
A chance of snow before 10am, then rain and snow between 10am and noon, then rain after noon. High near 38. Wind chill values between 20 and 30. East wind 7 to 9 mph. Chance of precipitation is 100%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Rain, mainly before 1am. Low around 36. Southeast wind 6 to 10 mph becoming west after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Partly sunny, with a high near 42. West wind around 6 mph becoming calm in the afternoon.
Wednesday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 36. Calm wind.
Thursday
Rain likely, mainly before 1pm. Cloudy, with a high near 41. Northeast wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain likely. Cloudy, with a low around 38. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 50 percent chance of rain before 1pm. Cloudy, with a high near 41.
Friday Night
Cloudy, with a low around 37.
Saturday
Cloudy, with a high near 49.
Saturday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Sunday
Mostly cloudy, with a high near 54.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 56.
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)
4:31 am EST Mar 3, 2026
7am EST Mar 3, 2026-6pm EDT Mar 9, 2026
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