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.

Partly Cloudy

35°F

2°C

Humidity 52%
Wind Speed W 15 G 22 mph
Barometer 29.79 in (1008.6 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 11 Feb 7:56 pm EST
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind around 11 mph.

    Low: 25 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 36. Wind chill values between 15 and 25. Northwest wind 10 to 14 mph.

    High: 36 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20. Wind chill values between 10 and 15. Northwest wind around 8 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 35. Wind chill values between 10 and 20. Northwest wind 7 to 9 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow showers or flurries after 1am. Mostly cloudy, with a low around 25. West wind around 7 mph.

    Low: 25 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Low: 28 °F

    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind around 11 mph.
Thursday
Mostly sunny, with a high near 36. Wind chill values between 15 and 25. Northwest wind 10 to 14 mph.
Thursday Night
Partly cloudy, with a low around 20. Wind chill values between 10 and 15. Northwest wind around 8 mph.
Friday
Sunny, with a high near 35. Wind chill values between 10 and 20. Northwest wind 7 to 9 mph.
Friday Night
A 20 percent chance of snow showers or flurries after 1am. Mostly cloudy, with a low around 25. West wind around 7 mph.
Saturday
Mostly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Partly sunny, with a high near 37.
Sunday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Washington's Birthday
A chance of rain and snow. Mostly cloudy, with a high near 40. Chance of precipitation is 40%.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
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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:
12:37 pm EST Feb 11, 2026
Forecast Valid:
8pm EST Feb 11, 2026-6pm EST Feb 18, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation