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.

28°F

-2°C

Humidity 66%
Wind Speed W 10 mph
Barometer 29.79 in (1008.8 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 24 Feb 4:56 am EST
Extended Forecast for

Brentwood NY

  • Today

    Today: Patchy blowing snow before 7am. Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 8 to 11 mph.

    High: 30 °F

    Patchy
    Blowing Snow
    then Partly
    Sunny

  • Tonight

    Tonight: A 50 percent chance of snow after 4am. Increasing clouds, with a temperature falling to near 19 by 9pm, then rising to around 31 during the remainder of the night. Light and variable wind becoming south 5 to 7 mph after midnight.

    Low: 19 °F⇑

    Mostly Clear
    then Chance
    Snow

  • Wednesday

    Wednesday: Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Southwest wind 9 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. West wind around 6 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of snow before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 38. West wind around 6 mph becoming south in the afternoon. Chance of precipitation is 50%.

    High: 38 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Snow Likely

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy blowing snow before 7am. Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 8 to 11 mph.
Tonight
A 50 percent chance of snow after 4am. Increasing clouds, with a temperature falling to near 19 by 9pm, then rising to around 31 during the remainder of the night. Light and variable wind becoming south 5 to 7 mph after midnight.
Wednesday
Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Southwest wind 9 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 29. West wind around 6 mph.
Thursday
A slight chance of snow before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 38. West wind around 6 mph becoming south in the afternoon. Chance of precipitation is 50%.
Thursday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Mostly sunny, with a high near 37.
Friday Night
Mostly clear, with a low around 27.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 39.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 30.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
1:15 am EST Feb 24, 2026
Forecast Valid:
5am EST Feb 24, 2026-6pm EST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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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