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

60°F

16°C

Humidity 60%
Wind Speed N 10 G 24 mph
Barometer 30.21 in (1023.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 15 Oct 9:56 am EDT
Extended Forecast for

Brentwood NY

  • Today

    Today: Mostly sunny, with a high near 62. Northeast wind 5 to 9 mph.

    High: 62 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 51. Southeast wind 5 to 7 mph.

    Low: 51 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely before 2pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 72. Southwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms. Low around 46. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Showers

  • Saturday

    Saturday: Showers likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 53. North wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 53 °F

    Showers
    Likely then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 62. Northeast wind 5 to 9 mph.
Tonight
A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 51. Southeast wind 5 to 7 mph.
Friday
Showers likely before 2pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 72. Southwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms. Low around 46. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 53. North wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 43.
Monday
Sunny, with a high near 60.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Sunny, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.27°W (Elev. 98 ft)
Last Update:
7:44 am EDT Oct 15, 2026
Forecast Valid:
10am EDT Oct 15, 2026-6pm EDT Oct 21, 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