National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

61°F

16°C

Humidity 29%
Wind Speed NW 14 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 11 Apr 5:56 pm EDT
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Clear, with a low around 38. Northwest wind 8 to 13 mph becoming light north after midnight.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 55. Northeast wind 6 to 11 mph becoming south in the afternoon. Winds could gust as high as 21 mph.

    High: 55 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. South wind around 11 mph.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 67. Breezy, with a southwest wind 11 to 20 mph.

    High: 67 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Monday Night

    Monday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 38. Northwest wind 8 to 13 mph becoming light north after midnight.
Sunday
Increasing clouds, with a high near 55. Northeast wind 6 to 11 mph becoming south in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 44. South wind around 11 mph.
Monday
Partly sunny, with a high near 67. Breezy, with a southwest wind 11 to 20 mph.
Monday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Tuesday
Partly sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
Mostly cloudy, with a low around 57.
Thursday
Partly sunny, with a high near 74.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 68.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 63.
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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:
2:27 pm EDT Apr 11, 2026
Forecast Valid:
6pm EDT Apr 11, 2026-6pm EDT Apr 18, 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