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.

Partly Cloudy

74°F

23°C

Humidity 79%
Wind Speed SW 20 G 33 mph
Barometer 29.97 in (1014.6 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 9 Sep 11:56 pm EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 73. Breezy, with a southwest wind around 21 mph.

    Low: 73 °F

    Mostly Cloudy
    and Breezy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 84. West wind 13 to 15 mph.

    High: 84 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 64. West wind around 6 mph becoming light and variable.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 77. North wind around 8 mph.

    High: 77 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of showers after 2am. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 50 percent chance of showers before 2pm. Mostly cloudy, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 73. Breezy, with a southwest wind around 21 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 84. West wind 13 to 15 mph.
Thursday Night
Mostly cloudy, with a low around 64. West wind around 6 mph becoming light and variable.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 77. North wind around 8 mph.
Friday Night
Mostly clear, with a low around 59. Calm wind.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
A 50 percent chance of showers after 2am. Mostly cloudy, with a low around 66.
Sunday
A 50 percent chance of showers before 2pm. Mostly cloudy, with a high near 78.
Sunday Night
Mostly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.76°N 73.07°W (Elev. 30 ft)
Last Update:
8:13 pm EDT Sep 9, 2026
Forecast Valid:
12am EDT Sep 10, 2026-6pm EDT Sep 16, 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