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.

Overcast

63°F

17°C

Humidity 90%
Wind Speed NE 12 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 21 Aug 3:56 am EDT
Extended Forecast for

Brentwood NY

High Surf Advisory August 21, 04:08am until August 22, 08:00pm
Coastal Flood Advisory August 22, 05:00am until August 22, 01:00pm
Coastal Flood Advisory August 22, 06:00pm until August 23, 02:00am
Coastal Flood Warning August 21, 05:00pm until August 22, 01:00am
Click here for hazard details and duration
High Surf Advisory
Coastal Flood Advisory
Coastal Flood Advisory
Coastal Flood Warning
  •  
    High Surf Advisory August 21, 04:08am until August 22, 08:00pm

    NOW until 8:00pm Fri

    High Surf Advisory

  • Overnight

    Low: 61 °F

    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before 8am. Cloudy, with a high near 73. Breezy, with a northeast wind 17 to 20 mph, with gusts as high as 32 mph.

    High: 73 °F

    Breezy.
    Chance
    Showers then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 60. Northeast wind 15 to 17 mph, with gusts as high as 29 mph.

    Low: 60 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 83. North wind 8 to 14 mph.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. Southwest wind 3 to 5 mph.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers likely, mainly before 5am. Cloudy, with a low around 61. Northeast wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A 30 percent chance of showers, mainly before 8am. Cloudy, with a high near 73. Breezy, with a northeast wind 17 to 20 mph, with gusts as high as 32 mph.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 60. Northeast wind 15 to 17 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 83. North wind 8 to 14 mph.
Friday Night
Mostly clear, with a low around 64. Southwest wind 3 to 5 mph.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 81. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny, with a high near 78.
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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:
1:51 am EDT Aug 21, 2025
Forecast Valid:
4am EDT Aug 21, 2025-6pm EDT Aug 27, 2025
 
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