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.

Light Snow Fog/Mist Blowing Snow and Windy

30°F

-1°C

Humidity 85%
Wind Speed N 29 mph
Barometer 29.39 in (995.3 mb)
Dewpoint 26°F (-3°C)
Visibility 1.00 mi
Wind Chill15°F (-9°C)
Last update 23 Feb 10:56 am EST
Extended Forecast for

Stony Brook NY

Blizzard Warning February 23, 11:35am until February 23, 06:00pm
Click here for hazard details and duration
Blizzard Warning
  •  
    Blizzard Warning February 23, 11:35am until February 23, 06:00pm

    NOW until 6:00pm Mon

    Blizzard Warning

  • Today

    High: 33 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Tonight

    Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 14 to 21 mph, with gusts as high as 33 mph.

    Low: 21 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 8 to 10 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow after 1am. Increasing clouds, with a low around 18. West wind around 6 mph becoming calm.

    Low: 18 °F

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: Rain and snow likely, becoming all rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Southwest wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely then
    Rain Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Partly sunny, with a high near 40. Chance of precipitation is 50%.

    High: 40 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.

    Low: 30 °F

    Rain Likely

Detailed Forecast

Today
Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 33. Wind chill values between 15 and 20. Windy, with a north wind 24 to 33 mph, with gusts as high as 49 mph. Chance of precipitation is 90%. Total daytime snow accumulation of 3 to 7 inches possible.
Tonight
Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 14 to 21 mph, with gusts as high as 33 mph.
Tuesday
Mostly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 8 to 10 mph.
Tuesday Night
A 50 percent chance of snow after 1am. Increasing clouds, with a low around 18. West wind around 6 mph becoming calm.
Wednesday
Rain and snow likely, becoming all rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Southwest wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 27.
Thursday
A chance of rain and snow after 1pm. Partly sunny, with a high near 40. Chance of precipitation is 50%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 41.
Friday Night
Mostly clear, with a low around 27.
Saturday
Sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.9°N 73.12°W (Elev. 148 ft)
Last Update:
1:42 am EST Feb 23, 2026
Forecast Valid:
11am EST Feb 23, 2026-6pm EST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation