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

37°F

3°C

Humidity 76%
Wind Speed Calm
Barometer 30.30 in (1026.0 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 8 Jan 8:56 pm EST
Extended Forecast for

Setauket-East Setauket NY

  • Tonight

    Tonight: Partly cloudy, with a steady temperature around 34. Calm wind.

    Low: 34 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of rain after 4pm. Mostly cloudy, with a high near 50. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 50 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 1am. Cloudy, with a low around 40. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 40 °F

    Chance Rain

  • Saturday

    Saturday: Rain, mainly after 1pm. Steady temperature around 43. Light and variable wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 43 °F

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: Rain. Low around 38. East wind around 7 mph becoming north after midnight. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Rain

  • Sunday

    Sunday: A 40 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 46. Breezy.

    High: 46 °F

    Chance Rain
    and Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. Breezy.

    Low: 28 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 39. Breezy.

    High: 39 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a steady temperature around 34. Calm wind.
Friday
A 40 percent chance of rain after 4pm. Mostly cloudy, with a high near 50. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A 50 percent chance of rain, mainly before 1am. Cloudy, with a low around 40. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Saturday
Rain, mainly after 1pm. Steady temperature around 43. Light and variable wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain. Low around 38. East wind around 7 mph becoming north after midnight. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 40 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 46. Breezy.
Sunday Night
Partly cloudy, with a low around 28. Breezy.
Monday
Mostly sunny, with a high near 39. Breezy.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 39.
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:
12:58 pm EST Jan 8, 2026
Forecast Valid:
9pm EST Jan 8, 2026-6pm EST Jan 15, 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