National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

37°F

3°C

Humidity 73%
Wind Speed SW 12 mph
Barometer 29.64 in (1003.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 25 Feb 2:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Partly cloudy, with a low around 29. Southwest wind around 6 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 1pm. Partly sunny, with a high near 38. Northwest wind around 5 mph becoming calm in the afternoon.

    High: 38 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 23. Calm wind.

    Low: 23 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 38. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.

    High: 38 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 28.

    Low: 28 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 29. Southwest wind around 6 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of snow after 1pm. Partly sunny, with a high near 38. Northwest wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 23. Calm wind.
Friday
Sunny, with a high near 38. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 29. Calm wind.
Saturday
Mostly sunny, with a high near 45.
Saturday Night
Increasing clouds, with a low around 28.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Partly cloudy, with a low around 19.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 28.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 17.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 40%.
Tuesday Night
Snow likely. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 40.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
12:43 pm EST Feb 25, 2026
Forecast Valid:
3pm EST Feb 25, 2026-6pm EST Mar 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation