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.

Overcast

32°F

0°C

Humidity 69%
Wind Speed NW 16 mph
Barometer 29.62 in (1003.0 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 23 Feb 6:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Patchy blowing snow. Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 13 to 23 mph, with gusts as high as 33 mph.

    Low: 21 °F

    Patchy
    Blowing Snow
    and Blustery

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind around 11 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow showers between 1am and 4am, then a chance of snow after 4am. Increasing clouds, with a low around 19. Wind chill values between 10 and 15. West wind 5 to 8 mph becoming light and variable. Chance of precipitation is 50%.

    Low: 19 °F

    Partly Cloudy
    then Chance
    Snow Showers

  • Wednesday

    Wednesday: Snow likely, mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Wind chill values between 20 and 30. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. West wind around 9 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Partly sunny, with a high near 37. Chance of precipitation is 50%.

    High: 37 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 70%.

    Low: 28 °F

    Snow Likely

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy blowing snow. Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 13 to 23 mph, with gusts as high as 33 mph.
Tuesday
Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind around 11 mph.
Tuesday Night
A chance of snow showers between 1am and 4am, then a chance of snow after 4am. Increasing clouds, with a low around 19. Wind chill values between 10 and 15. West wind 5 to 8 mph becoming light and variable. Chance of precipitation is 50%.
Wednesday
Snow likely, mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Wind chill values between 20 and 30. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 29. West wind around 9 mph.
Thursday
A chance of rain and snow after 1pm. Partly sunny, with a high near 37. Chance of precipitation is 50%.
Thursday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 70%.
Friday
Mostly sunny, with a high near 38.
Friday Night
Mostly clear, with a low around 27.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Partly sunny, with a high near 39.
Sunday Night
Mostly cloudy, with a low around 20.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 32.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
12:58 pm EST Feb 23, 2026
Forecast Valid:
7pm EST Feb 23, 2026-6pm EST Mar 2, 2026
 
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Additional Resources

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Chance of Precipitation