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.

Partly Cloudy

34°F

1°C

Humidity 73%
Wind Speed W 9 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 4 Dec 6:56 am EST
Extended Forecast for

Sayville NY

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 41. Breezy, with a west wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon.

    High: 41 °F

    Mostly Sunny
    then
    Decreasing
    Clouds and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 19. Wind chill values between 5 and 15. Blustery, with a north wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.

    Low: 19 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Friday

    Friday: A 20 percent chance of light snow after 4pm. Increasing clouds, with a high near 37. Wind chill values between 10 and 20. Light and variable wind becoming southeast 5 to 7 mph in the morning.

    High: 37 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A chance of rain and snow before 1am, then a chance of rain between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 30. South wind around 5 mph becoming light and variable. Chance of precipitation is 40%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of snow before 7am, then a chance of rain between 7am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 42. North wind 5 to 9 mph becoming west in the afternoon. Chance of precipitation is 30%.

    High: 42 °F

    Chance
    Rain/Snow
    then Slight
    Chance Light
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 41. Breezy, with a west wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon.
Tonight
Mostly clear, with a low around 19. Wind chill values between 5 and 15. Blustery, with a north wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.
Friday
A 20 percent chance of light snow after 4pm. Increasing clouds, with a high near 37. Wind chill values between 10 and 20. Light and variable wind becoming southeast 5 to 7 mph in the morning.
Friday Night
A chance of rain and snow before 1am, then a chance of rain between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 30. South wind around 5 mph becoming light and variable. Chance of precipitation is 40%.
Saturday
A chance of snow before 7am, then a chance of rain between 7am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 42. North wind 5 to 9 mph becoming west in the afternoon. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 42.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 41.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 46.
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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:
6:44 am EST Dec 4, 2025
Forecast Valid:
7am EST Dec 4, 2025-6pm EST Dec 10, 2025
 
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Additional Resources

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