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

19°F

-7°C

Humidity 52%
Wind Speed W 12 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill6°F (-14°C)
Last update 27 Jan 6:56 pm EST
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Partly cloudy, with a low around 10. Wind chill values between zero and 5. West wind 8 to 10 mph, with gusts as high as 23 mph.

    Low: 10 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 23. Wind chill values between zero and 10. West wind 6 to 9 mph.

    High: 23 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 9. Wind chill values between zero and 5. West wind around 6 mph.

    Low: 9 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 21. Wind chill values between zero and 10. West wind 6 to 10 mph.

    High: 21 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 7. Northwest wind around 8 mph.

    Low: 7 °F

    Mostly Clear

  • Friday

    Friday: Sunny and cold, with a high near 19.

    High: 19 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 4.

    Low: 4 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 22.

    High: 22 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 15.

    Low: 15 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 10. Wind chill values between zero and 5. West wind 8 to 10 mph, with gusts as high as 23 mph.
Wednesday
Increasing clouds, with a high near 23. Wind chill values between zero and 10. West wind 6 to 9 mph.
Wednesday Night
Mostly cloudy, with a low around 9. Wind chill values between zero and 5. West wind around 6 mph.
Thursday
Sunny, with a high near 21. Wind chill values between zero and 10. West wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 7. Northwest wind around 8 mph.
Friday
Sunny and cold, with a high near 19.
Friday Night
Partly cloudy, with a low around 4.
Saturday
Partly sunny, with a high near 22.
Saturday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 15.
Sunday
A 50 percent chance of snow. Mostly cloudy, with a high near 28. Blustery.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Mostly sunny, with a high near 31.
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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:
12:48 pm EST Jan 27, 2026
Forecast Valid:
7pm EST Jan 27, 2026-6pm EST Feb 3, 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