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

39°F

4°C

Humidity 46%
Wind Speed SW 14 mph
Barometer 30.09 in
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 12 Jan 4:56 pm EST
Extended Forecast for

East Setauket NY

  • Tonight

    Tonight: Mostly clear, with a low around 31. West wind 8 to 10 mph.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 44. West wind 7 to 9 mph.

    High: 44 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 40. South wind around 10 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Cloudy, with a high near 46. Southwest wind 6 to 8 mph.

    High: 46 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 1am. Cloudy, with a low around 31. Calm wind becoming west around 5 mph after midnight.

    Low: 31 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a temperature rising to near 38 by 9am, then falling to around 34 during the remainder of the day.

    High: 38 °F⇓

    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 31. West wind 8 to 10 mph.
Tuesday
Mostly sunny, with a high near 44. West wind 7 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 40. South wind around 10 mph.
Wednesday
A 20 percent chance of showers before 1pm. Cloudy, with a high near 46. Southwest wind 6 to 8 mph.
Wednesday Night
A 50 percent chance of showers, mainly after 1am. Cloudy, with a low around 31. Calm wind becoming west around 5 mph after midnight.
Thursday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a temperature rising to near 38 by 9am, then falling to around 34 during the remainder of the day.
Thursday Night
Mostly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Mostly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
A chance of rain and snow. Partly sunny, with a high near 36. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 31.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
12:48 pm EST Jan 12, 2026
Forecast Valid:
5pm EST Jan 12, 2026-6pm EST Jan 19, 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