Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Light Snow Fog/Mist
30°F
-1°C
| Humidity | 92% |
| Wind Speed | NE 8 mph |
| Barometer | 30.07 in (1018.2 mb) |
| Dewpoint | 28°F (-2°C) |
| Visibility | 1.75 mi |
| Wind Chill | 22°F (-6°C) |
| Last update | 16 Feb 12:56 am EST |
Extended Forecast for
Port Jefferson NY
Overnight
Low: 29 °F
Snow Likely
Washington's Birthday
High: 36 °F
Chance Snow
then Mostly
SunnyMonday Night
Low: 27 °F
Mostly Cloudy
then Slight
Chance
Snow/SleetTuesday
High: 40 °F
Partly Sunny
Tuesday Night
Low: 31 °F
Increasing
CloudsWednesday
High: 39 °F
Chance Rain
then Rain
LikelyWednesday Night
Low: 33 °F
Rain Likely
then Mostly
CloudyThursday
High: 39 °F
Mostly Cloudy
Thursday Night
Low: 30 °F
Mostly Cloudy
Detailed Forecast
Overnight
Snow likely, mainly before 4am. Cloudy, with a low around 29. Wind chill values between 20 and 25. Northeast wind around 7 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than one inch possible.
Washington's Birthday
A 30 percent chance of snow before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 36. Wind chill values between 20 and 30. Northeast wind 5 to 9 mph becoming light in the afternoon.
Monday Night
A slight chance of snow showers and sleet after 1am. Mostly cloudy, with a low around 27. Calm wind. Chance of precipitation is 20%.
Tuesday
Partly sunny, with a high near 40. Calm wind becoming southwest 5 to 7 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 31. Calm wind.
Wednesday
Rain likely, mainly after noon. Cloudy, with a high near 39. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain likely before midnight. Cloudy, with a low around 33. Chance of precipitation is 60%.
Thursday
Mostly cloudy, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 30.
Friday
Rain likely, mainly after noon. Mostly cloudy, with a high near 41. Chance of precipitation is 70%.
Friday Night
Rain likely. Cloudy, with a low around 32. Chance of precipitation is 60%.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 41.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
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)
7:19 pm EST Feb 15, 2026
1am EST Feb 16, 2026-6pm EST Feb 22, 2026
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