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.

Mostly Cloudy

21°F

-6°C

Humidity 45%
Wind Speed N 3 mph
Barometer 30.35 in (1027.7 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Last update 5 Dec 6:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 36. Wind chill values between 15 and 25. Northeast wind 5 to 7 mph becoming southeast in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of snow after 10pm, mixing with freezing rain after 4am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 30%.

    Low: 29 °F

    Slight Chance
    Light Snow
    then Chance
    Wintry Mix

  • Saturday

    Saturday: A chance of snow and freezing rain before 8am, then a slight chance of rain between 8am and 10am. Mostly cloudy, with a high near 45. Light and variable wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 45 °F

    Chance Wintry
    Mix then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. Northwest wind 6 to 8 mph.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 43. North wind around 7 mph becoming south in the afternoon.

    High: 43 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers before 1am. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Chance Snow
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 36. Breezy.

    High: 36 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 36. Wind chill values between 15 and 25. Northeast wind 5 to 7 mph becoming southeast in the afternoon.
Tonight
A chance of snow after 10pm, mixing with freezing rain after 4am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 30%.
Saturday
A chance of snow and freezing rain before 8am, then a slight chance of rain between 8am and 10am. Mostly cloudy, with a high near 45. Light and variable wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 30. Northwest wind 6 to 8 mph.
Sunday
Increasing clouds, with a high near 43. North wind around 7 mph becoming south in the afternoon.
Sunday Night
A 30 percent chance of snow showers before 1am. Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 36. Breezy.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Partly sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 50.
Wednesday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 47.
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
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:53 am EST Dec 5, 2025
Forecast Valid:
7am EST Dec 5, 2025-6pm EST Dec 11, 2025
 
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