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

47°F

8°C

Humidity 34%
Wind Speed W 16 G 24 mph
Barometer 29.96 in (1014.7 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 22 Jan 2:56 pm EST
Extended Forecast for

Brentwood NY

Winter Storm Watch January 25, 03:00am until January 26, 06:00pm
Cold Weather Advisory January 23, 10:00pm until January 24, 10:00am
Click here for hazard details and duration
Winter Storm Watch
Cold Weather Advisory

  • Tonight

    Tonight: Mostly cloudy, with a low around 26. West wind 7 to 9 mph, with gusts as high as 21 mph.

    Low: 26 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36. Wind chill values between 20 and 30. West wind 6 to 16 mph, with gusts as high as 31 mph.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Northwest wind 10 to 16 mph, with gusts as high as 31 mph.

    Low: 10 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after 1am. Cloudy, with a steady temperature around 15. North wind 3 to 6 mph.

    Low: 15 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow. The snow could be heavy at times. High near 27. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.

    High: 27 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow. Low around 20. Chance of precipitation is 100%.

    Low: 20 °F

    Snow

  • Monday

    Monday: Snow likely, mainly before noon. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.

    High: 29 °F

    Snow Likely

  • Monday Night

    Monday Night: A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 11.

    Low: 11 °F

    Chance Snow
    Showers then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 26. West wind 7 to 9 mph, with gusts as high as 21 mph.
Friday
Mostly sunny, with a high near 36. Wind chill values between 20 and 30. West wind 6 to 16 mph, with gusts as high as 31 mph.
Friday Night
Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Northwest wind 10 to 16 mph, with gusts as high as 31 mph.
Saturday
Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 40 percent chance of snow after 1am. Cloudy, with a steady temperature around 15. North wind 3 to 6 mph.
Sunday
Snow. The snow could be heavy at times. High near 27. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.
Sunday Night
Snow. Low around 20. Chance of precipitation is 100%.
Monday
Snow likely, mainly before noon. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 11.
Tuesday
Mostly sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 11.
Wednesday
Mostly sunny, with a high near 26.
Wednesday Night
Mostly cloudy, with a low around 13.
Thursday
Partly sunny, with a high near 25.
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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:
2:40 pm EST Jan 22, 2026
Forecast Valid:
3pm EST Jan 22, 2026-6pm EST Jan 29, 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