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.

21°F

-6°C

Humidity 81%
Wind Speed N 15 mph
Barometer 29.73 in (1007.0 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 26 Jan 2:56 am EST
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: A chance of snow and sleet before 4am, then a chance of snow. Cloudy, with a steady temperature around 26. Wind chill values between 15 and 20. North wind 11 to 14 mph. Chance of precipitation is 30%.

    Low: 26 °F

    Chance
    Snow/Sleet

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Cloudy, with a high near 30. Wind chill values between 15 and 20. North wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 30 °F

    Chance Snow

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12. Wind chill values between zero and 10. West wind 10 to 13 mph, with gusts as high as 28 mph.

    Low: 12 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 22. Wind chill values between zero and 10. West wind 9 to 13 mph, with gusts as high as 24 mph.

    High: 22 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 10. West wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 10 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 22.

    High: 22 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 9.

    Low: 9 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 21.

    High: 21 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 5.

    Low: 5 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of snow and sleet before 4am, then a chance of snow. Cloudy, with a steady temperature around 26. Wind chill values between 15 and 20. North wind 11 to 14 mph. Chance of precipitation is 30%.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 30. Wind chill values between 15 and 20. North wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 12. Wind chill values between zero and 10. West wind 10 to 13 mph, with gusts as high as 28 mph.
Tuesday
Mostly sunny, with a high near 22. Wind chill values between zero and 10. West wind 9 to 13 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly clear, with a low around 10. West wind 8 to 10 mph, with gusts as high as 22 mph.
Wednesday
Mostly sunny, with a high near 22.
Wednesday Night
Mostly cloudy, with a low around 9.
Thursday
Mostly sunny, with a high near 21.
Thursday Night
Mostly clear, with a low around 5.
Friday
Mostly sunny and cold, with a high near 19.
Friday Night
Mostly clear, with a low around 8.
Saturday
Sunny, with a high near 24.
Saturday Night
Mostly clear, with a low around 12.
Sunday
Mostly sunny, with a high near 28.
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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:
1:49 am EST Jan 26, 2026
Forecast Valid:
3am EST Jan 26, 2026-6pm EST Feb 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation