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.

Partly Cloudy

41°F

5°C

Humidity 60%
Wind Speed Calm
Barometer 30.29 in (1025.7 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 8 Jan 7:56 pm EST
Extended Forecast for

East Setauket NY

  • Tonight

    Tonight: Partly cloudy, with a low around 31. Calm wind.

    Low: 31 °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. High near 46. Northwest wind 5 to 7 mph becoming east in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 46 °F

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: Rain. Steady temperature around 41. East wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °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 29. Breezy.

    Low: 29 °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 32.

    Low: 32 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 31. 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. High near 46. Northwest wind 5 to 7 mph becoming east in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain. Steady temperature around 41. East wind 6 to 8 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 29. Breezy.
Monday
Mostly sunny, with a high near 39. Breezy.
Monday Night
Partly cloudy, with a low around 32.
Tuesday
Sunny, with a high near 42.
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.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
12:58 pm EST Jan 8, 2026
Forecast Valid:
8pm EST Jan 8, 2026-6pm EST Jan 15, 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