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

47°F

8°C

Humidity 61%
Wind Speed S 10 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 28 Feb 1:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 48. South wind around 9 mph.

    High: 48 °F

    Sunny

  • Tonight

    Tonight: Patchy fog between 11pm and 2am. Otherwise, increasing clouds, with a low around 28. Light and variable wind.

    Low: 28 °F

    Patchy Fog

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 35. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 35 °F

    Snow Likely

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 7 mph, with gusts as high as 21 mph.

    Low: 15 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 28. North wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%.

    High: 41 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain. Low around 36. Chance of precipitation is 90%.

    Low: 36 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 48. South wind around 9 mph.
Tonight
Patchy fog between 11pm and 2am. Otherwise, increasing clouds, with a low around 28. Light and variable wind.
Sunday
Snow likely, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 35. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 7 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 28. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 19.
Tuesday
A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%.
Tuesday Night
Rain. Low around 36. Chance of precipitation is 90%.
Wednesday
Mostly cloudy, with a high near 46.
Wednesday Night
A 40 percent chance of rain. Cloudy, with a low around 35.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 49.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
A 40 percent chance of rain. 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
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
1:49 pm EST Feb 28, 2026
Forecast Valid:
1pm EST Feb 28, 2026-6pm EST Mar 6, 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