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.

A Few Clouds

55°F

13°C

Humidity 83%
Wind Speed SW 7 mph
Barometer 30.34 in (1027.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 2 Nov 7:56 pm EST
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Mostly clear, with a low around 47. Southwest wind 3 to 6 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52. Southwest wind 3 to 5 mph.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 70. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 70 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 57. South wind 3 to 5 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A 50 percent chance of showers after 1pm. Mostly cloudy, with a high near 70.

    High: 70 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm. Low around 58. Chance of precipitation is 80%.

    Low: 58 °F

    Rain

  • Friday

    Friday: Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.

    High: 67 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 47. Southwest wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 68. Light southwest wind increasing to 5 to 10 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 52. Southwest wind 3 to 5 mph.
Wednesday
Sunny, with a high near 70. Light southwest wind becoming south 5 to 10 mph in the morning.
Wednesday Night
Increasing clouds, with a low around 57. South wind 3 to 5 mph.
Thursday
A 50 percent chance of showers after 1pm. Mostly cloudy, with a high near 70.
Thursday Night
Rain and possibly a thunderstorm. Low around 58. Chance of precipitation is 80%.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Friday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 60.
Sunday Night
Partly cloudy, with a low around 43.
Monday
A 30 percent chance of rain. Partly sunny, with a high near 60.
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:
3:41 pm EST Nov 2, 2026
Forecast Valid:
8pm EST Nov 2, 2026-6pm EST Nov 9, 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