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

43°F

6°C

Humidity 86%
Wind Speed E 5 mph
Barometer 29.51 in (999.3 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 14 Jan 6:56 pm EST
Extended Forecast for

East Setauket NY

  • Tonight

    Tonight: A 50 percent chance of rain. Cloudy, with a low around 39. South wind 5 to 7 mph.

    Low: 39 °F

    Chance Rain

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 42 by 10am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon.

    High: 42 °F⇓

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 21. Wind chill values between 5 and 15. Breezy, with a west wind 17 to 20 mph.

    Low: 21 °F

    Mostly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Sunny, with a high near 36. Wind chill values between 5 and 15. Breezy, with a west wind 11 to 20 mph.

    High: 36 °F

    Sunny and
    Breezy then
    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a steady temperature around 32. Southwest wind 8 to 11 mph.

    Low: 32 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 40%.

    High: 41 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 1am. Partly cloudy, with a low around 20.

    Low: 20 °F

    Chance Snow

Detailed Forecast

Tonight
A 50 percent chance of rain. Cloudy, with a low around 39. South wind 5 to 7 mph.
Thursday
Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 42 by 10am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 21. Wind chill values between 5 and 15. Breezy, with a west wind 17 to 20 mph.
Friday
Sunny, with a high near 36. Wind chill values between 5 and 15. Breezy, with a west wind 11 to 20 mph.
Friday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a steady temperature around 32. Southwest wind 8 to 11 mph.
Saturday
A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.
Sunday Night
A 30 percent chance of snow before 1am. Partly cloudy, with a low around 20.
M.L.King Day
Sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Mostly sunny, with a high near 26.
Tuesday Night
Partly cloudy, with a low around 15.
Wednesday
Mostly sunny, with a high near 29.
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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:
2:31 pm EST Jan 14, 2026
Forecast Valid:
7pm EST Jan 14, 2026-6pm EST Jan 21, 2026
 
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