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

24°F

-4°C

Humidity 40%
Wind Speed NW 15 G 24 mph
Barometer 30.19 in (1022.4 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 9 Feb 12:56 pm EST
Extended Forecast for

Brentwood NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 27. Wind chill values between 15 and 20. Northwest wind 7 to 11 mph.

    High: 27 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 17. Northwest wind around 5 mph becoming calm in the evening.

    Low: 17 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain and snow after 4pm. Mostly cloudy, with a high near 37. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 37 °F

    Partly Sunny
    then Slight
    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: A chance of rain and snow before 4am, then a slight chance of snow. Cloudy, then gradually becoming partly cloudy, with a low around 28. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 50%.

    Low: 28 °F

    Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. West wind 6 to 14 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 27. Wind chill values between 15 and 20. Northwest wind 7 to 11 mph.
Tonight
Mostly cloudy, with a low around 17. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of rain and snow after 4pm. Mostly cloudy, with a high near 37. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
Tuesday Night
A chance of rain and snow before 4am, then a slight chance of snow. Cloudy, then gradually becoming partly cloudy, with a low around 28. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 50%.
Wednesday
Mostly sunny, with a high near 38. West wind 6 to 14 mph.
Wednesday Night
Partly cloudy, with a low around 23.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Partly cloudy, with a low around 19.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly clear, with a low around 21.
Saturday
Sunny, with a high near 35.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 40%.
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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:
1:12 pm EST Feb 9, 2026
Forecast Valid:
1pm EST Feb 9, 2026-6pm EST Feb 15, 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