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

20°F

-7°C

Humidity 41%
Wind Speed W 13 G 24 mph
Barometer 30.26 in (1024.9 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 20 Jan 9:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Sunny, with a high near 24. Wind chill values between 10 and 15. West wind around 15 mph, with gusts as high as 28 mph.

    High: 24 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 14. Wind chill values between 5 and 10. West wind 6 to 10 mph, with gusts as high as 22 mph.

    Low: 14 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 40. Wind chill values between 10 and 20. West wind 5 to 13 mph becoming south in the afternoon.

    High: 40 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a steady temperature around 36. Southwest wind 10 to 13 mph, with gusts as high as 25 mph.

    Low: 36 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 43. West wind 9 to 13 mph.

    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 34.

    High: 34 °F

    Partly Sunny

  • Friday Night

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

    Low: 11 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 20.

    High: 20 °F

    Cold

Detailed Forecast

Today
Sunny, with a high near 24. Wind chill values between 10 and 15. West wind around 15 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 14. Wind chill values between 5 and 10. West wind 6 to 10 mph, with gusts as high as 22 mph.
Wednesday
Increasing clouds, with a high near 40. Wind chill values between 10 and 20. West wind 5 to 13 mph becoming south in the afternoon.
Wednesday Night
Mostly cloudy, with a steady temperature around 36. Southwest wind 10 to 13 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 43. West wind 9 to 13 mph.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 11.
Saturday
Partly sunny and cold, with a high near 20.
Saturday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 11.
Sunday
Snow likely. Mostly cloudy, with a high near 22. Chance of precipitation is 60%.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 12.
Monday
A 30 percent chance of snow. Mostly sunny, with a high near 24.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:07 am EST Jan 20, 2026
Forecast Valid:
10am EST Jan 20, 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