Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

46°F

8°C

Humidity 51%
Wind Speed NW 10 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 6 Apr 2:56 am EDT
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: Mostly clear, with a low around 39. Northwest wind around 8 mph.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 54. Northwest wind around 10 mph, with gusts as high as 20 mph.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: A chance of showers between 11pm and 2am.  Mostly cloudy, with a low around 39. Light and variable wind.  Chance of precipitation is 30%.

    Low: 39 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52. Northwest wind 7 to 14 mph.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30. North wind 7 to 9 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 39. Northwest wind around 8 mph.
Monday
Sunny, with a high near 54. Northwest wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers between 11pm and 2am. Mostly cloudy, with a low around 39. Light and variable wind. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 52. Northwest wind 7 to 14 mph.
Tuesday Night
Mostly clear, with a low around 30. North wind 7 to 9 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 47.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Mostly sunny, with a high near 51.
Thursday Night
Partly cloudy, with a low around 41.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
2:34 am EDT Apr 6, 2026
3am EDT Apr 6, 2026-6pm EDT Apr 12, 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