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

32°F

0°C

Humidity 43%
Wind Speed W 14 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 31 Dec 10:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Partly sunny, with a high near 34. Wind chill values between 20 and 25. West wind 14 to 16 mph.

    High: 34 °F

    Partly Sunny

  • Tonight

    Tonight: Light snow, mainly between 1am and 4am. Steady temperature around 29. Wind chill values between 15 and 20. Southwest wind 9 to 14 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Chance Light
    Snow then
    Light Snow

  • New Year's Day

    New Year's Day: A 20 percent chance of snow showers before 10am. Mostly sunny, with a temperature rising to near 30 by 9am, then falling to around 24 during the remainder of the day. Wind chill values between 10 and 20. Blustery, with a northwest wind 16 to 24 mph, with gusts as high as 34 mph.

    High: 30 °F⇓

    Blustery.
    Slight Chance
    Snow Showers
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph.

    Low: 17 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 31. West wind 9 to 16 mph.

    High: 31 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 32.

    High: 32 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 34. Wind chill values between 20 and 25. West wind 14 to 16 mph.
Tonight
Light snow, mainly between 1am and 4am. Steady temperature around 29. Wind chill values between 15 and 20. Southwest wind 9 to 14 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
New Year's Day
A 20 percent chance of snow showers before 10am. Mostly sunny, with a temperature rising to near 30 by 9am, then falling to around 24 during the remainder of the day. Wind chill values between 10 and 20. Blustery, with a northwest wind 16 to 24 mph, with gusts as high as 34 mph.
Thursday Night
Mostly clear, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph.
Friday
Partly sunny, with a high near 31. West wind 9 to 16 mph.
Friday Night
Mostly clear, with a low around 22.
Saturday
Increasing clouds, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Partly sunny, with a high near 37.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 39.
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:
5:51 am EST Dec 31, 2025
Forecast Valid:
11am EST Dec 31, 2025-6pm EST Jan 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