Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Snow

12°F

-11°C

Humidity 77%
Wind Speed NE 12 mph
Barometer 30.54 in (1034.4 mb)
Dewpoint 6°F (-14°C)
Visibility 2.00 mi
Wind Chill-2°F (-19°C)
Last update 25 Jan 7:56 am EST
Extended Forecast for

Brentwood NY

Winter Storm Warning until January 26, 01:00pm
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning until January 26, 01:00pm

    NOW until 1:00pm Mon

    Winter Storm Warning

  • Today

    High: 32 °F

    Heavy Snow
    then
    Snow/Sleet

  • Tonight

    Tonight: Sleet, possibly mixed with freezing rain, mainly before 1am.  Steady temperature around 29. Wind chill values between 15 and 20. Northeast wind 9 to 17 mph, with gusts as high as 32 mph.  Chance of precipitation is 100%. New ice accumulation of less than a 0.1 of an inch possible.  New sleet accumulation of 1 to 2 inches possible.

    Low: 29 °F

    Wintry Mix
    then Wintry
    Mix Likely

  • Monday

    Monday: A chance of snow, freezing rain, and sleet before 7am, then a chance of snow and freezing rain between 7am and 4pm, then a slight chance of snow after 4pm.  Cloudy, with a high near 31. Wind chill values between 15 and 20. North wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.  Chance of precipitation is 40%.

    High: 31 °F

    Chance Wintry
    Mix

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13. Wind chill values between zero and 10. West wind 13 to 15 mph, with gusts as high as 29 mph.

    Low: 13 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 22. West wind around 11 mph, with gusts as high as 22 mph.

    High: 22 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

Detailed Forecast

Today
Snow before 4pm, then snow and sleet. The snow could be heavy at times. High near 32. Wind chill values between 5 and 15. Northeast wind 7 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. Total daytime snow and sleet accumulation of 6 to 10 inches possible.
Tonight
Sleet, possibly mixed with freezing rain, mainly before 1am. Steady temperature around 29. Wind chill values between 15 and 20. Northeast wind 9 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New ice accumulation of less than a 0.1 of an inch possible. New sleet accumulation of 1 to 2 inches possible.
Monday
A chance of snow, freezing rain, and sleet before 7am, then a chance of snow and freezing rain between 7am and 4pm, then a slight chance of snow after 4pm. Cloudy, with a high near 31. Wind chill values between 15 and 20. North wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 40%.
Monday Night
Partly cloudy, with a low around 13. Wind chill values between zero and 10. West wind 13 to 15 mph, with gusts as high as 29 mph.
Tuesday
Mostly sunny, with a high near 22. West wind around 11 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 9.
Wednesday
Mostly sunny, with a high near 23.
Wednesday Night
Mostly cloudy, with a low around 12.
Thursday
Partly sunny, with a high near 23.
Thursday Night
Mostly clear, with a low around 8.
Friday
Mostly sunny, with a high near 22.
Friday Night
Partly cloudy, with a low around 11.
Saturday
Mostly sunny, with a high near 27.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
5:25 am EST Jan 25, 2026
8am EST Jan 25, 2026-6pm EST Jan 31, 2026
 
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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