National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Drizzle Fog/Mist

39°F

4°C

Humidity 93%
Wind Speed E 10 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 37°F (3°C)
Visibility 2.00 mi
Wind Chill32°F (0°C)
Last update 5 Mar 6:56 pm EST
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Rain, mainly before 4am. Low around 34. Northeast wind 7 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 34 °F

    Rain

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Mostly cloudy, with a high near 41. Northeast wind 6 to 9 mph.

    High: 41 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain after 1am. Patchy fog. Otherwise, cloudy, with a low around 34. Light northeast wind.

    Low: 34 °F

    Patchy Fog
    then Slight
    Chance Rain
    and Patchy
    Fog

  • Saturday

    Saturday: Cloudy, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.

    High: 49 °F

    Cloudy

  • Saturday Night

    Saturday Night: Rain likely. Cloudy, with a temperature rising to around 47 by 4am. Southwest wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 44 °F⇑

    Rain Likely

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 57.

    High: 57 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Rain, mainly before 4am. Low around 34. Northeast wind 7 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 30 percent chance of rain, mainly before 7am. Mostly cloudy, with a high near 41. Northeast wind 6 to 9 mph.
Friday Night
A 20 percent chance of rain after 1am. Patchy fog. Otherwise, cloudy, with a low around 34. Light northeast wind.
Saturday
Cloudy, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
Rain likely. Cloudy, with a temperature rising to around 47 by 4am. Southwest wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 56.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 56.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 50.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
1:01 pm EST Mar 5, 2026
Forecast Valid:
7pm EST Mar 5, 2026-6pm EDT Mar 12, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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