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

37°F

3°C

Humidity 89%
Wind Speed Calm
Barometer 29.91 in (1013.0 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 6 Dec 6:56 am EST
Extended Forecast for

5 Miles SSE West Sayville NY

  • Today

    Today: A chance of drizzle, mainly before 10am. Mostly cloudy, with a high near 43. North wind 6 to 11 mph becoming west in the afternoon.

    High: 43 °F

    Chance
    Drizzle

  • Tonight

    Tonight: Partly cloudy, with a low around 35. West wind 10 to 15 mph.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42. North wind 7 to 10 mph becoming southwest in the afternoon.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 29. Wind chill values between 20 and 25. Blustery, with a west wind 11 to 16 mph increasing to 20 to 25 mph after midnight.

    Low: 29 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Blustery

  • Monday

    Monday: Mostly sunny, with a steady temperature around 31. Windy, with a north wind 21 to 29 mph.

    High: 31 °F

    Mostly Sunny
    and Windy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Blustery.

    Low: 25 °F

    Partly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39. Breezy.

    Low: 39 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 48. Breezy.

    High: 48 °F

    Breezy.
    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Today
A chance of drizzle, mainly before 10am. Mostly cloudy, with a high near 43. North wind 6 to 11 mph becoming west in the afternoon.
Tonight
Partly cloudy, with a low around 35. West wind 10 to 15 mph.
Sunday
Partly sunny, with a high near 42. North wind 7 to 10 mph becoming southwest in the afternoon.
Sunday Night
Mostly cloudy, with a low around 29. Wind chill values between 20 and 25. Blustery, with a west wind 11 to 16 mph increasing to 20 to 25 mph after midnight.
Monday
Mostly sunny, with a steady temperature around 31. Windy, with a north wind 21 to 29 mph.
Monday Night
Partly cloudy, with a low around 25. Blustery.
Tuesday
Partly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 39. Breezy.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 48. Breezy.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39. Breezy.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 43. Breezy.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 33. Breezy.
Friday
A chance of rain and snow. Partly sunny, with a high near 39. Breezy. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE West Sayville NY
 40.67°N 73.06°W (Elev. 0 ft)
Last Update:
5:44 am EST Dec 6, 2025
Forecast Valid:
7am EST Dec 6, 2025-6pm EST Dec 12, 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