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 and Breezy

65°F

18°C

Humidity 81%
Wind Speed NE 21 G 30 mph
Barometer 29.97 in (1014.9 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 21 Aug 9:56 am EDT
Extended Forecast for

Sayville NY

High Surf Advisory August 21, 10:58am 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, 10:58am until August 22, 08:00pm

    NOW until 8:00pm Fri

    High Surf Advisory

  • Today

    High: 72 °F

    Breezy.
    Slight Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 61. Breezy, with a northeast wind 18 to 20 mph, with gusts as high as 34 mph.

    Low: 61 °F

    Decreasing
    Clouds and
    Breezy

  • Friday

    Friday: Sunny, with a high near 80. North wind 9 to 16 mph.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 66. South wind around 6 mph.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 79. Southwest wind 6 to 10 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers before 11am. Cloudy, with a high near 72. Breezy, with a northeast wind around 22 mph, with gusts as high as 34 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 61. Breezy, with a northeast wind 18 to 20 mph, with gusts as high as 34 mph.
Friday
Sunny, with a high near 80. North wind 9 to 16 mph.
Friday Night
Mostly clear, with a low around 66. South wind around 6 mph.
Saturday
Sunny, with a high near 79. Southwest wind 6 to 10 mph.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Mostly sunny, with a high near 78.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 78.
Monday Night
A 30 percent chance of showers before 2am. Partly cloudy, with a low around 65.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
1:51 am EDT Aug 21, 2025
Forecast Valid:
10am 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