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

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

21°F

-6°C

Humidity 47%
Wind Speed SW 6 mph
Barometer 30.01 in (1016.2 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 28 Jan 4:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A slight chance of snow before 10pm, then a slight chance of flurries between 10pm and 1am. Mostly cloudy, with a low around 9. Wind chill values between zero and 5. West wind around 6 mph. Chance of precipitation is 20%.

    Low: 9 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 22. Wind chill values between zero and 10. West wind 6 to 10 mph.

    High: 22 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 7. Wind chill values between -5 and 5. Northwest wind around 9 mph, with gusts as high as 20 mph.

    Low: 7 °F

    Mostly Clear

  • Friday

    Friday: Sunny and cold, with a high near 18. Wind chill values between -5 and 5. West wind 8 to 11 mph.

    High: 18 °F

    Cold

  • Friday Night

    Friday Night: Mostly clear, with a low around 5. Northwest wind 3 to 6 mph.

    Low: 5 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 21.

    High: 21 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 14.

    Low: 14 °F

    Chance Snow

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, with a high near 26. Blustery. Chance of precipitation is 60%.

    High: 26 °F

    Snow Likely
    and Blustery

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 17.

    Low: 17 °F

    Chance Snow

Detailed Forecast

Tonight
A slight chance of snow before 10pm, then a slight chance of flurries between 10pm and 1am. Mostly cloudy, with a low around 9. Wind chill values between zero and 5. West wind around 6 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 22. Wind chill values between zero and 10. West wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 7. Wind chill values between -5 and 5. Northwest wind around 9 mph, with gusts as high as 20 mph.
Friday
Sunny and cold, with a high near 18. Wind chill values between -5 and 5. West wind 8 to 11 mph.
Friday Night
Mostly clear, with a low around 5. Northwest wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 21.
Saturday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 14.
Sunday
Snow likely, mainly before 1pm. Cloudy, with a high near 26. Blustery. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Partly sunny, with a high near 32.
Tuesday Night
Partly cloudy, with a low around 16.
Wednesday
Mostly sunny, with a high near 30.
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:
4:40 pm EST Jan 28, 2026
Forecast Valid:
5pm EST Jan 28, 2026-6pm EST Feb 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