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.

Light Rain Fog/Mist

38°F

3°C

Humidity 93%
Wind Speed E 13 G 21 mph
Barometer 29.59 in (1002.0 mb)
Dewpoint 36°F (2°C)
Visibility 2.00 mi
Wind Chill30°F (-1°C)
Last update 20 Feb 3:56 pm EST
Extended Forecast for

Brentwood NY

Winter Storm Watch February 22, 06:00am until February 23, 06:00pm
Coastal Flood Watch February 22, 10:00pm until February 23, 04:00am
Click here for hazard details and duration
Winter Storm Watch
Coastal Flood Watch

  • This Afternoon

    This Afternoon: Rain likely. Cloudy, with a high near 40. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 40 °F

    Rain Likely

  • Tonight

    Tonight: Rain likely before 1am, then a slight chance of rain and snow between 1am and 3am, then a slight chance of snow after 3am. Mostly cloudy, with a low around 31. Northeast wind around 5 mph becoming light and variable. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 31 °F

    Rain Likely
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 45. Northwest wind around 6 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of rain before 10pm, then a chance of rain and snow. Mostly cloudy, with a low around 30. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 40%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then snow likely after 1pm. Cloudy, with a high near 37. East wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    High: 37 °F

    Rain/Snow
    Likely

  • Sunday Night

    Sunday Night: Snow. Areas of blowing snow. Low around 28. Windy. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Low: 28 °F

    Snow and
    Areas Blowing
    Snow

  • Monday

    Monday: Snow, mainly before 1pm. Areas of blowing snow before 1pm. High near 35. Windy. Chance of precipitation is 80%.

    High: 35 °F

    Snow and
    Areas Blowing
    Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Rain likely. Cloudy, with a high near 40. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain likely before 1am, then a slight chance of rain and snow between 1am and 3am, then a slight chance of snow after 3am. Mostly cloudy, with a low around 31. Northeast wind around 5 mph becoming light and variable. Chance of precipitation is 60%. Little or no snow accumulation expected.
Saturday
Mostly sunny, with a high near 45. Northwest wind around 6 mph.
Saturday Night
A chance of rain before 10pm, then a chance of rain and snow. Mostly cloudy, with a low around 30. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 40%.
Sunday
A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then snow likely after 1pm. Cloudy, with a high near 37. East wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Sunday Night
Snow. Areas of blowing snow. Low around 28. Windy. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.
Monday
Snow, mainly before 1pm. Areas of blowing snow before 1pm. High near 35. Windy. Chance of precipitation is 80%.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 34.
Tuesday Night
Mostly cloudy, with a low around 21.
Wednesday
A 30 percent chance of snow. Mostly cloudy, with a high near 40.
Wednesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 32.
Thursday
Rain likely. Mostly cloudy, with a high near 43. Chance of precipitation is 60%.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 40.
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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:
2:17 pm EST Feb 20, 2026
Forecast Valid:
4pm EST Feb 20, 2026-6pm EST Feb 27, 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