National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

38°F

3°C

Humidity 73%
Wind Speed W 6 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 6 Dec 5:56 pm EST
Extended Forecast for

Sayville NY

  • Tonight

    Tonight: Mostly clear, with a low around 29. Northwest wind 6 to 9 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 42. Northwest wind 5 to 8 mph becoming south in the afternoon.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 7 to 13 mph.

    Low: 25 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32. Wind chill values between 15 and 20. North wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18. North wind 6 to 11 mph.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 42.

    High: 42 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 48.

    High: 48 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 29. Northwest wind 6 to 9 mph.
Sunday
Partly sunny, with a high near 42. Northwest wind 5 to 8 mph becoming south in the afternoon.
Sunday Night
Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 7 to 13 mph.
Monday
Mostly sunny, with a high near 32. Wind chill values between 15 and 20. North wind 14 to 16 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 18. North wind 6 to 11 mph.
Tuesday
Increasing clouds, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 48.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 44.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30.
Friday
A chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 35.
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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:
4:40 pm EST Dec 6, 2025
Forecast Valid:
6pm EST Dec 6, 2025-6pm EST Dec 13, 2025
 
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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