Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
33°F
1°C
| Humidity | 92% |
| Wind Speed | N 9 mph |
| Barometer | 30.02 in (1016.4 mb) |
| Dewpoint | 31°F (-1°C) |
| Visibility | 10.00 mi |
| Wind Chill | 25°F (-4°C) |
| Last update | 1 Mar 4:56 am EST |
Extended Forecast for
Port Jefferson NY
Today
High: 34 °F
Snow Likely
Tonight
Low: 19 °F
Mostly Clear
Monday
High: 28 °F
Mostly Sunny
Monday Night
Low: 24 °F
Mostly Clear
Tuesday
High: 39 °F
Chance
Rain/Snow
then
Rain/SnowTuesday Night
Low: 38 °F
Rain
Wednesday
High: 43 °F
Chance Rain
Wednesday Night
Low: 38 °F
Chance Rain
Thursday
High: 48 °F
Chance Rain
Detailed Forecast
Today
Snow likely, mainly before 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 34. Wind chill values between 25 and 30. North wind 8 to 10 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Mostly clear, with a low around 19. Wind chill values between 5 and 15. North wind 11 to 14 mph.
Monday
Mostly sunny, with a high near 28. Wind chill values between 5 and 15. North wind 5 to 10 mph becoming light and variable in the afternoon.
Monday Night
Mostly clear, with a low around 24. Wind chill values between 15 and 20. South wind around 6 mph.
Tuesday
A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then rain after 1pm. High near 39. South wind 6 to 8 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain. Low around 38. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 43.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 38.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 48.
Thursday Night
Rain likely, mainly after 1am. Cloudy, with a low around 39. Chance of precipitation is 60%.
Friday
A 50 percent chance of rain. Cloudy, with a high near 42.
Friday Night
A 30 percent chance of rain. Cloudy, with a low around 39.
Saturday
Cloudy, with a high near 50.
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)
1:58 am EST Mar 1, 2026
6am EST Mar 1, 2026-6pm EST Mar 7, 2026
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