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.

Mostly Cloudy

56°F

13°C

Humidity 72%
Wind Speed S 7 mph
Barometer 29.89 in (1012.0 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 3 Nov 4:56 pm EST
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: A chance of showers between 7pm and 9pm. Cloudy during the early evening, then gradual clearing, with a low around 45. Southwest wind 7 to 16 mph becoming northwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 30%.

    Low: 45 °F

    Chance
    Showers then
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 61. Northwest wind 14 to 17 mph, with gusts as high as 32 mph.

    High: 61 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42. West wind 5 to 8 mph, with gusts as high as 23 mph.

    Low: 42 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 62. Southwest wind 5 to 15 mph, with gusts as high as 26 mph.

    High: 62 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain before 1am. Partly cloudy, with a low around 44. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 37 mph.

    Low: 44 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Friday Night

    Friday Night: Rain likely. Cloudy, with a low around 50. Chance of precipitation is 70%.

    Low: 50 °F

    Rain Likely

Detailed Forecast

Tonight
A chance of showers between 7pm and 9pm. Cloudy during the early evening, then gradual clearing, with a low around 45. Southwest wind 7 to 16 mph becoming northwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 61. Northwest wind 14 to 17 mph, with gusts as high as 32 mph.
Tuesday Night
Mostly clear, with a low around 42. West wind 5 to 8 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 62. Southwest wind 5 to 15 mph, with gusts as high as 26 mph.
Wednesday Night
A 20 percent chance of rain before 1am. Partly cloudy, with a low around 44. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 37 mph.
Thursday
Sunny, with a high near 55.
Thursday Night
Partly cloudy, with a low around 38.
Friday
Partly sunny, with a high near 61.
Friday Night
Rain likely. Cloudy, with a low around 50. Chance of precipitation is 70%.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 43.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
1:08 pm EST Nov 3, 2025
Forecast Valid:
5pm EST Nov 3, 2025-6pm EST Nov 10, 2025
 
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