National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

35°F

2°C

Humidity 89%
Wind Speed SW 9 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 32°F (0°C)
Visibility 9.00 mi
Wind Chill28°F (-2°C)
Last update 17 Jan 4:56 pm EST
Extended Forecast for

East Setauket NY

Winter Weather Advisory January 18, 10:00am until January 18, 10:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: A 40 percent chance of snow, mainly after 4am. Mostly cloudy, with a low around 31. West wind 5 to 7 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Periods of snow, mainly after 7am. High near 34. Calm wind becoming northwest around 6 mph in the morning. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    High: 34 °F

    Snow

  • Sunday Night

    Sunday Night: A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 23. North wind around 7 mph becoming northwest after midnight.

    Low: 23 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 33. Wind chill values between 15 and 20. West wind 8 to 15 mph.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18. West wind around 15 mph.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of snow, mainly after 4am. Mostly cloudy, with a low around 31. West wind 5 to 7 mph becoming calm in the evening.
Sunday
Periods of snow, mainly after 7am. High near 34. Calm wind becoming northwest around 6 mph in the morning. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
Sunday Night
A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 23. North wind around 7 mph becoming northwest after midnight.
M.L.King Day
Mostly sunny, with a high near 33. Wind chill values between 15 and 20. West wind 8 to 15 mph.
Monday Night
Partly cloudy, with a low around 18. West wind around 15 mph.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 15.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Mostly cloudy, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 33.
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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:
5:41 pm EST Jan 17, 2026
Forecast Valid:
5pm EST Jan 17, 2026-6pm EST Jan 24, 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