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.

Fair

26°F

-3°C

Humidity 75%
Wind Speed Calm
Barometer 30.02 in (1016.4 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 27 Feb 3:56 am EST
Extended Forecast for

Sayville NY

  • Today

    Today: Sunny, with a high near 41. Light and variable wind becoming south around 6 mph in the afternoon.

    High: 41 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 29. South wind 3 to 5 mph.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 47. Wind chill values between 25 and 35 early. South wind 5 to 7 mph.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31. Calm wind becoming north around 5 mph after midnight.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Scattered snow showers before 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 38. Northwest wind 7 to 11 mph. Chance of precipitation is 40%.

    High: 38 °F

    Scattered
    Snow Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 28.

    High: 28 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 39.

    High: 39 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Today
Sunny, with a high near 41. Light and variable wind becoming south around 6 mph in the afternoon.
Tonight
Mostly clear, with a low around 29. South wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 47. Wind chill values between 25 and 35 early. South wind 5 to 7 mph.
Saturday Night
Partly cloudy, with a low around 31. Calm wind becoming north around 5 mph after midnight.
Sunday
Scattered snow showers before 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 38. Northwest wind 7 to 11 mph. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Mostly cloudy, with a high near 28.
Monday Night
Mostly cloudy, with a low around 21.
Tuesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 39.
Tuesday Night
Rain likely. Cloudy, with a low around 31. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 33.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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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:
12:50 am EST Feb 27, 2026
Forecast Valid:
4am EST Feb 27, 2026-6pm EST Mar 5, 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