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.

Mostly Cloudy

7°F

-14°C

Humidity 70%
Wind Speed Calm
Barometer 30.17 in (1021.9 mb)
Dewpoint -1°F (-18°C)
Visibility 10.00 mi
Last update 31 Jan 7:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Cold Weather Advisory January 31, 08:09am until February 1, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory January 31, 08:09am until February 1, 10:00am

    NOW until 10:00am Sun

    Cold Weather Advisory

  • Today

    High: 22 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 12. Wind chill values between -5 and 5. North wind 7 to 16 mph.

    Low: 12 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 24. Wind chill values between -5 and 5. Blustery, with a north wind 17 to 22 mph, with gusts as high as 32 mph.

    High: 24 °F

    Mostly Cloudy
    and Blustery

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 14. Wind chill values between zero and 10. Northwest wind 11 to 16 mph.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 30. Northwest wind 9 to 11 mph.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 31.

    High: 31 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

Detailed Forecast

Today
Partly sunny, with a high near 22. Wind chill values between -5 and 5. North wind 5 to 8 mph.
Tonight
Mostly cloudy, with a low around 12. Wind chill values between -5 and 5. North wind 7 to 16 mph.
Sunday
Mostly cloudy, with a high near 24. Wind chill values between -5 and 5. Blustery, with a north wind 17 to 22 mph, with gusts as high as 32 mph.
Sunday Night
Mostly cloudy, with a low around 14. Wind chill values between zero and 10. Northwest wind 11 to 16 mph.
Monday
Mostly sunny, with a high near 30. Northwest wind 9 to 11 mph.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 31.
Tuesday Night
Partly cloudy, with a low around 18.
Wednesday
Mostly sunny, with a high near 31.
Wednesday Night
Partly cloudy, with a low around 15.
Thursday
Mostly sunny, with a high near 29.
Thursday Night
Partly cloudy, with a low around 15.
Friday
Mostly sunny, with a high near 31.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:07 am EST Jan 31, 2026
Forecast Valid:
8am EST Jan 31, 2026-6pm EST Feb 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation