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.

Fair

15°F

-9°C

Humidity 46%
Wind Speed NW 15 G 26 mph
Barometer 30.10 in (1019.3 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Wind Chill0°F (-18°C)
Last update 30 Jan 12:56 am EST
Extended Forecast for

Brentwood NY

Cold Weather Advisory January 30, 01:49am until January 31, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory January 30, 01:49am until January 31, 10:00am

    NOW until 10:00am Sat

    Cold Weather Advisory

  • Overnight

    Low: 5 °F

    Mostly Clear

  • Friday

    Friday: Sunny and cold, with a high near 17. Wind chill values between -10 and zero. West wind 8 to 11 mph, with gusts as high as 21 mph.

    High: 17 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 4. Wind chill values between -5 and zero. Northwest wind 3 to 6 mph.

    Low: 4 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 20. Wind chill values between -5 and 5. North wind 3 to 7 mph.

    High: 20 °F

    Cold

  • Saturday Night

    Saturday Night: A 30 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 12. North wind 6 to 11 mph increasing to 12 to 17 mph after midnight. Winds could gust as high as 30 mph.

    Low: 12 °F

    Chance Snow

  • Sunday

    Sunday: A 40 percent chance of snow. Cloudy, with a high near 24. Blustery.

    High: 24 °F

    Chance Snow
    and Blustery

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 5. Wind chill values between -5 and zero. Northwest wind around 8 mph, with gusts as high as 20 mph.
Friday
Sunny and cold, with a high near 17. Wind chill values between -10 and zero. West wind 8 to 11 mph, with gusts as high as 21 mph.
Friday Night
Partly cloudy, with a low around 4. Wind chill values between -5 and zero. Northwest wind 3 to 6 mph.
Saturday
Partly sunny and cold, with a high near 20. Wind chill values between -5 and 5. North wind 3 to 7 mph.
Saturday Night
A 30 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 12. North wind 6 to 11 mph increasing to 12 to 17 mph after midnight. Winds could gust as high as 30 mph.
Sunday
A 40 percent chance of snow. Cloudy, with a high near 24. Blustery.
Sunday Night
Mostly cloudy, with a low around 15.
Monday
Mostly sunny, with a high near 31.
Monday Night
Mostly clear, with a low around 16.
Tuesday
Mostly sunny, with a high near 33.
Tuesday Night
Partly cloudy, with a low around 17.
Wednesday
Mostly sunny, with a high near 30.
Wednesday Night
Partly cloudy, with a low around 15.
Thursday
A 30 percent chance of snow. Partly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
1:13 pm EST Jan 29, 2026
Forecast Valid:
1am EST Jan 30, 2026-6pm EST Feb 5, 2026
 
Forecast Discussion
 
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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