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

31°F

-1°C

Humidity 52%
Wind Speed NW 17 G 29 mph
Barometer 29.94 in (1013.9 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 12 Feb 10:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Partly sunny, with a high near 35. Wind chill values between 20 and 25. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.

    High: 35 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 11 mph.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind around 6 mph.

    Low: 24 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 39. West wind 7 to 11 mph.

    High: 39 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Low: 28 °F

    Chance
    Rain/Snow

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 35. Wind chill values between 20 and 25. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.
Tonight
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.
Friday
Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 11 mph.
Friday Night
A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind around 6 mph.
Saturday
Mostly sunny, with a high near 39. West wind 7 to 11 mph.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Washington's Birthday
Mostly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 43.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
5:34 am EST Feb 12, 2026
Forecast Valid:
11am EST Feb 12, 2026-6pm EST Feb 18, 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