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

32°F

0°C

Humidity 36%
Wind Speed W 18 G 43 mph
Barometer 29.65 in (1004.0 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 30 Dec 9:56 am EST
Extended Forecast for

Stony Brook NY

Wind Advisory December 30, 10:20am until December 30, 06:00pm
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory December 30, 10:20am until December 30, 06:00pm

    NOW until 6:00pm Tue

    Wind Advisory

  • Today

    High: 31 °F

    Mostly Cloudy
    and Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 13 to 18 mph, with gusts as high as 33 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 34. Wind chill values between 15 and 25. West wind 10 to 13 mph.

    High: 34 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 23. Southwest wind around 10 mph.

    Low: 23 °F

    Chance Snow

  • New Year's Day

    New Year's Day: A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 30. Northwest wind 10 to 13 mph.

    High: 30 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 31.

    High: 31 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly cloudy, with a high near 31. Wind chill values between 15 and 20. Breezy, with a west wind 18 to 20 mph, with gusts as high as 43 mph.
Tonight
Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 13 to 18 mph, with gusts as high as 33 mph.
Wednesday
Mostly cloudy, with a high near 34. Wind chill values between 15 and 25. West wind 10 to 13 mph.
Wednesday Night
A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 23. Southwest wind around 10 mph.
New Year's Day
A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 30. Northwest wind 10 to 13 mph.
Thursday Night
Partly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 31.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 19.
Sunday
Sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 23.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
1:04 am EST Dec 30, 2025
Forecast Valid:
10am EST Dec 30, 2025-6pm EST Jan 5, 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