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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 50 percent chance of snow. Cloudy, with a steady temperature around 31. Wind chill values between 20 and 25. West wind around 11 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Chance Snow

  • New Year's Day

    New Year's Day: Snow likely, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a temperature falling to around 26 by 9am. Wind chill values between 15 and 20. Northwest wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 33 °F⇓

    Snow Likely
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 17. Wind chill values between 10 and 15. West wind 6 to 10 mph, with gusts as high as 22 mph.

    Low: 17 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 7 to 11 mph, with gusts as high as 22 mph.

    High: 30 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20. West wind around 6 mph.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 32.

    High: 32 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Cloudy, with a low around 23.

    Low: 23 °F

    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Overnight
A 50 percent chance of snow. Cloudy, with a steady temperature around 31. Wind chill values between 20 and 25. West wind around 11 mph, with gusts as high as 25 mph.
New Year's Day
Snow likely, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a temperature falling to around 26 by 9am. Wind chill values between 15 and 20. Northwest wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday Night
Increasing clouds, with a low around 17. Wind chill values between 10 and 15. West wind 6 to 10 mph, with gusts as high as 22 mph.
Friday
Partly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 7 to 11 mph, with gusts as high as 22 mph.
Friday Night
Partly cloudy, with a low around 20. West wind around 6 mph.
Saturday
Increasing clouds, with a high near 32.
Saturday Night
Cloudy, with a low around 23.
Sunday
Mostly sunny, with a high near 33.
Sunday Night
Mostly clear, with a low around 19.
Monday
Partly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 25.
Tuesday
Mostly cloudy, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
12:54 am EST Jan 1, 2026
Forecast Valid:
5am EST Jan 1, 2026-6pm EST Jan 7, 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