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

42°F

6°C

Humidity 53%
Wind Speed NW 17 G 28 mph
Barometer 30.26 in (1024.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 1 Dec 8:56 am EST
Extended Forecast for

Sayville NY

  • Today

    Today: Sunny, with a high near 42. Northwest wind 10 to 14 mph.

    High: 42 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 30. North wind around 6 mph becoming calm.

    Low: 30 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain. High near 48. Southeast wind 6 to 14 mph becoming north in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    High: 48 °F

    Rain

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Wind chill values between 20 and 25. Northwest wind 14 to 16 mph, with gusts as high as 30 mph.

    Low: 31 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 40. Northwest wind 8 to 11 mph.

    High: 40 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 20.

    Low: 20 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 42. Northwest wind 10 to 14 mph.
Tonight
Increasing clouds, with a low around 30. North wind around 6 mph becoming calm.
Tuesday
Rain. High near 48. Southeast wind 6 to 14 mph becoming north in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Tuesday Night
A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Wind chill values between 20 and 25. Northwest wind 14 to 16 mph, with gusts as high as 30 mph.
Wednesday
Sunny, with a high near 40. Northwest wind 8 to 11 mph.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Mostly clear, with a low around 20.
Friday
Mostly sunny, with a high near 38.
Friday Night
A 50 percent chance of snow after 10pm. Mostly cloudy, with a low around 29.
Saturday
Rain likely. Mostly cloudy, with a high near 42. Chance of precipitation is 60%.
Saturday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 43.
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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:
1:19 am EST Dec 1, 2025
Forecast Valid:
9am EST Dec 1, 2025-6pm EST Dec 7, 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