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.

Fog/Mist

50°F

10°C

Humidity 96%
Wind Speed SW 15 G 22 mph
Barometer 29.86 in (1011.2 mb)
Dewpoint 49°F (9°C)
Visibility 2.50 mi
Wind Chill45°F (7°C)
Last update 5 Apr 8:56 am EDT
Extended Forecast for

Brentwood NY

  • Today

    Today: Rain and possibly a thunderstorm. High near 58. Southwest wind 13 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 58 °F

    Rain

  • Tonight

    Tonight: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Southwest wind around 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Rain Likely
    then Mostly
    Clear

  • Monday

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

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain. Partly cloudy, with a low around 39. West wind around 5 mph.

    Low: 39 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. West wind 8 to 14 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 46.

    High: 46 °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 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

Today
Rain and possibly a thunderstorm. High near 58. Southwest wind 13 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Southwest wind around 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Sunny, with a high near 54. West wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of rain. Partly cloudy, with a low around 39. West wind around 5 mph.
Tuesday
Mostly sunny, with a high near 51. West wind 8 to 14 mph.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 46.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Mostly sunny, with a high near 53.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Partly sunny, with a high near 60.
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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:
5:03 am EDT Apr 5, 2026
Forecast Valid:
9am EDT Apr 5, 2026-6pm EDT Apr 11, 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