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.

A Few Clouds

42°F

6°C

Humidity 49%
Wind Speed N 10 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 3 Dec 1:56 pm EST
Extended Forecast for

East Setauket NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 40. Northwest wind 5 to 7 mph.

    High: 40 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 5 to 10 mph.

    Low: 30 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 40. Wind chill values between 25 and 30. West wind 10 to 18 mph, with gusts as high as 33 mph.

    High: 40 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 36 mph.

    Low: 18 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 33. North wind 5 to 7 mph becoming south in the afternoon.

    High: 33 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A 30 percent chance of light snow. Cloudy, with a low around 28.

    Low: 28 °F

    Chance Light
    Snow

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 39.

    High: 39 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 40. Northwest wind 5 to 7 mph.
Tonight
Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 5 to 10 mph.
Thursday
Increasing clouds, with a high near 40. Wind chill values between 25 and 30. West wind 10 to 18 mph, with gusts as high as 33 mph.
Thursday Night
Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 36 mph.
Friday
A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 33. North wind 5 to 7 mph becoming south in the afternoon.
Friday Night
A 30 percent chance of light snow. Cloudy, with a low around 28.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 42.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
12:40 pm EST Dec 3, 2025
Forecast Valid:
2pm EST Dec 3, 2025-6pm EST Dec 9, 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