Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

19°F

-7°C

Humidity 62%
Wind Speed Calm
Barometer 30.14 in (1020.9 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 10 Feb 2:56 am EST
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 17. Calm wind.

    Low: 17 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 37. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon.

    High: 37 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Rain and sleet likely before 1am, then a chance of rain between 1am and 4am.  Mostly cloudy, with a low around 29. Light and variable wind becoming west around 5 mph after midnight.  Chance of precipitation is 70%. Little or no sleet accumulation expected.

    Low: 29 °F

    Rain/Sleet
    Likely

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. West wind 6 to 13 mph, with gusts as high as 26 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23. West wind around 9 mph, with gusts as high as 24 mph.

    Low: 23 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 17. Calm wind.
Tuesday
Mostly cloudy, with a high near 37. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Rain and sleet likely before 1am, then a chance of rain between 1am and 4am. Mostly cloudy, with a low around 29. Light and variable wind becoming west around 5 mph after midnight. Chance of precipitation is 70%. Little or no sleet accumulation expected.
Wednesday
Mostly sunny, with a high near 38. West wind 6 to 13 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 23. West wind around 9 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 19.
Friday
Sunny, with a high near 34.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 37.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Rain likely. Cloudy, with a low around 30. Chance of precipitation is 60%.
Washington's Birthday
A 50 percent chance of rain. Cloudy, with a high near 40.
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
2:28 am EST Feb 10, 2026
3am EST Feb 10, 2026-6pm EST Feb 16, 2026
 
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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