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.

Fair

42°F

6°C

Humidity 65%
Wind Speed W 15 mph
Barometer 30.12 in (1019.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 1 Dec 1:56 am EST
Extended Forecast for

East Setauket NY

  • Overnight

    Overnight: Mostly clear, with a low around 35. West wind around 14 mph.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 41. Northwest wind 8 to 14 mph.

    High: 41 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of rain and snow after 4am. Increasing clouds, with a low around 30. North wind around 6 mph becoming calm. Chance of precipitation is 20%.

    Low: 30 °F

    Partly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday

    Tuesday: A slight chance of rain and snow before 7am, then rain. High near 46. East wind 6 to 13 mph becoming north in the afternoon. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 46 °F

    Rain/Snow
    then Rain

  • Tuesday Night

    Tuesday Night: A chance of rain, mixing with snow after 10pm, then gradually ending. Cloudy, then gradually becoming partly cloudy, with a low around 30. Northwest wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Wednesday

    Wednesday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 35. West wind around 14 mph.
Monday
Sunny, with a high near 41. Northwest wind 8 to 14 mph.
Monday Night
A slight chance of rain and snow after 4am. Increasing clouds, with a low around 30. North wind around 6 mph becoming calm. Chance of precipitation is 20%.
Tuesday
A slight chance of rain and snow before 7am, then rain. High near 46. East wind 6 to 13 mph becoming north in the afternoon. Chance of precipitation is 100%. Little or no snow accumulation expected.
Tuesday Night
A chance of rain, mixing with snow after 10pm, then gradually ending. Cloudy, then gradually becoming partly cloudy, with a low around 30. Northwest wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Wednesday
Sunny, with a high near 40.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Mostly clear, with a low around 19.
Friday
Mostly sunny, with a high near 36.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 29.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 40. Chance of precipitation is 50%.
Saturday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 42.
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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:
1:19 am EST Dec 1, 2025
Forecast Valid:
2am EST Dec 1, 2025-6pm EST Dec 7, 2025
 
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