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.

Heavy Snow Freezing Fog and Breezy

30°F

-1°C

Humidity 100%
Wind Speed NE 22 G 32 mph
Barometer 29.81 in (1009.3 mb)
Dewpoint 30°F (-1°C)
Visibility 0.25 mi
Wind Chill17°F (-8°C)
Last update 22 Feb 7:56 pm EST
Extended Forecast for

Brentwood NY

Coastal Flood Advisory February 23, 11:00am until February 23, 06:00pm
Blizzard Warning February 22, 08:25pm until February 23, 06:00pm
Coastal Flood Warning February 22, 10:00pm until February 23, 04:00am
Click here for hazard details and duration
Coastal Flood Advisory
Blizzard Warning
Coastal Flood Warning
  •  
    Blizzard Warning February 22, 08:25pm until February 23, 06:00pm

    NOW until 6:00pm Mon

    Blizzard Warning

  • Tonight

    Low: 28 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday

    Monday: Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 32. Wind chill values between 15 and 20. Windy, with a north wind 29 to 34 mph decreasing to 23 to 28 mph in the afternoon. Winds could gust as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    High: 32 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday Night

    Monday Night: Cloudy, then gradually becoming partly cloudy, with a low around 20. Wind chill values between 10 and 15. Northwest wind 13 to 18 mph, with gusts as high as 32 mph.

    Low: 20 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 30 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow after 1am. Increasing clouds, with a low around 17. West wind around 6 mph becoming calm.

    Low: 17 °F

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: Rain and snow likely before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after noon. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.

    High: 42 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

Detailed Forecast

Tonight
Snow. The snow could be heavy at times. Areas of blowing snow after 10pm. Low around 28. Wind chill values between 15 and 20. Windy, with a north wind 22 to 27 mph increasing to 29 to 34 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 14 to 20 inches possible.
Monday
Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 32. Wind chill values between 15 and 20. Windy, with a north wind 29 to 34 mph decreasing to 23 to 28 mph in the afternoon. Winds could gust as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.
Monday Night
Cloudy, then gradually becoming partly cloudy, with a low around 20. Wind chill values between 10 and 15. Northwest wind 13 to 18 mph, with gusts as high as 32 mph.
Tuesday
Sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 40 percent chance of snow after 1am. Increasing clouds, with a low around 17. West wind around 6 mph becoming calm.
Wednesday
Rain and snow likely before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 29.
Thursday
A chance of rain and snow after noon. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.
Friday
A 30 percent chance of snow before 7am. Partly sunny, with a high near 41.
Friday Night
Mostly clear, with a low around 28.
Saturday
Sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.8°N 73.23°W (Elev. 98 ft)
Last Update:
5:56 pm EST Feb 22, 2026
Forecast Valid:
8pm EST Feb 22, 2026-6pm EST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation