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

49°F

9°C

Humidity 93%
Wind Speed S 6 mph
Barometer 30.04 in (1017.4 mb)
Dewpoint 47°F (8°C)
Visibility 9.00 mi
Wind Chill46°F (8°C)
Last update 10 Mar 10:56 am EDT
Extended Forecast for

Setauket-East Setauket NY

  • Today

    Today: Sunny, with a high near 64. South wind 5 to 10 mph.

    High: 64 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. South wind around 5 mph becoming calm in the evening.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 60. South wind 3 to 8 mph.

    High: 60 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 48. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 48 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of rain before 5pm, then a chance of rain and snow showers. Mostly cloudy, with a temperature falling to around 42 by 5pm. Northwest wind 13 to 15 mph. Chance of precipitation is 50%.

    High: 48 °F⇓

    Chance Rain
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A chance of rain and snow showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 45.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 64. South wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 40. South wind around 5 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 60. South wind 3 to 8 mph.
Wednesday Night
A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 48. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Thursday
A chance of rain before 5pm, then a chance of rain and snow showers. Mostly cloudy, with a temperature falling to around 42 by 5pm. Northwest wind 13 to 15 mph. Chance of precipitation is 50%.
Thursday Night
A chance of rain and snow showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Chance of precipitation is 30%.
Friday
Increasing clouds, with a high near 45.
Friday Night
Mostly cloudy, with a low around 35.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Cloudy, with a high near 50.
Sunday Night
Rain. Low around 40. Chance of precipitation is 80%.
Monday
Rain. High near 51. Chance of precipitation is 80%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
10:53 am EDT Mar 10, 2026
Forecast Valid:
11am EDT Mar 10, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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