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.

A Few Clouds

28°F

-2°C

Humidity 63%
Wind Speed SW 9 mph
Barometer 30.02 in (1016.5 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 19 Jan 8:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly clear, with a low around 15. Wind chill values between 5 and 15. West wind 11 to 16 mph, with gusts as high as 26 mph.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 23. Wind chill values between zero and 10. West wind 10 to 15 mph, with gusts as high as 28 mph.

    High: 23 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 5 to 9 mph, with gusts as high as 23 mph.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 37. Wind chill values between 10 and 20. Light and variable wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 22 mph.

    High: 37 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a steady temperature around 35. Southwest wind 8 to 10 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 15. Wind chill values between 5 and 15. West wind 11 to 16 mph, with gusts as high as 26 mph.
Tuesday
Sunny, with a high near 23. Wind chill values between zero and 10. West wind 10 to 15 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 5 to 9 mph, with gusts as high as 23 mph.
Wednesday
Increasing clouds, with a high near 37. Wind chill values between 10 and 20. Light and variable wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 22 mph.
Wednesday Night
Mostly cloudy, with a steady temperature around 35. Southwest wind 8 to 10 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 11.
Saturday
Mostly cloudy and cold, with a high near 20.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 8.
Sunday
A 30 percent chance of snow. Mostly cloudy and cold, with a high near 20.
Sunday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 10.
Monday
Partly sunny, with a high near 23.
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:
7:14 pm EST Jan 19, 2026
Forecast Valid:
9pm EST Jan 19, 2026-6pm EST Jan 26, 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