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

32°F

0°C

Humidity 33%
Wind Speed NW 16 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 2 Feb 4:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Mostly clear, with a low around 16. Wind chill values between 10 and 15. Northwest wind 5 to 9 mph.

    Low: 16 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 34. Wind chill values between 15 and 25. West wind 3 to 7 mph.

    High: 34 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of light snow between 1am and 4am. Mostly cloudy, with a low around 22. Southwest wind 3 to 6 mph. Chance of precipitation is 20%.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 33. Wind chill values between 15 and 25. Northwest wind 6 to 9 mph.

    High: 33 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 17. Northwest wind around 6 mph.

    Low: 17 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny
    then Chance
    Snow

  • Friday Night

    Friday Night: A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 10. Breezy.

    Low: 10 °F

    Chance Snow
    and Breezy

Detailed Forecast

Tonight
Mostly clear, with a low around 16. Wind chill values between 10 and 15. Northwest wind 5 to 9 mph.
Tuesday
Mostly sunny, with a high near 34. Wind chill values between 15 and 25. West wind 3 to 7 mph.
Tuesday Night
A slight chance of light snow between 1am and 4am. Mostly cloudy, with a low around 22. Southwest wind 3 to 6 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 33. Wind chill values between 15 and 25. Northwest wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 17. Northwest wind around 6 mph.
Thursday
Mostly sunny, with a high near 28.
Thursday Night
Partly cloudy, with a low around 13.
Friday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 30.
Friday Night
A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 10. Breezy.
Saturday
Mostly sunny and cold, with a high near 18. Blustery.
Saturday Night
Partly cloudy, with a low around 7. Blustery.
Sunday
Mostly sunny and cold, with a high near 20.
Sunday Night
Partly cloudy, with a low around 9.
Monday
Mostly sunny, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
1:22 pm EST Feb 2, 2026
Forecast Valid:
5pm EST Feb 2, 2026-6pm EST Feb 9, 2026
 
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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