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.

Overcast

45°F

7°C

Humidity 90%
Wind Speed W 13 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 30 Nov 8:56 pm EST
Extended Forecast for

Sayville NY

  • Tonight

    Tonight: A 40 percent chance of rain before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West wind around 16 mph, with gusts as high as 26 mph.

    Low: 36 °F

    Chance Rain
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: 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. South wind 6 to 14 mph becoming northeast 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 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 29. Northwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 29 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 40.

    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 43.

    High: 43 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20. Blustery.

    Low: 20 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

Detailed Forecast

Tonight
A 40 percent chance of rain before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West wind around 16 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 30. North wind around 6 mph becoming calm.
Tuesday
Rain. High near 48. South wind 6 to 14 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Tuesday Night
A 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 29. Northwest wind around 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny, with a high near 40.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 20. Blustery.
Friday
Mostly sunny, with a high near 38.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 27.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 44.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 42.
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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:
5:44 pm EST Nov 30, 2025
Forecast Valid:
9pm EST Nov 30, 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