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

31°F

-1°C

Humidity 96%
Wind Speed NE 14 G 28 mph
Barometer 29.84 in (1010.3 mb)
Dewpoint 30°F (-1°C)
Visibility 0.75 mi
Wind Chill21°F (-6°C)
Last update 22 Feb 6:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Blizzard Warning February 22, 07:38pm until February 23, 06:00pm
Coastal Flood Warning February 23, 12:00am until February 23, 05:00am
Click here for hazard details and duration
Blizzard Warning
...
  •  
    Blizzard Warning February 22, 07:38pm until February 23, 06:00pm

    NOW until 6:00pm Mon

    Blizzard Warning

  • Tonight

    Low: 29 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday

    Monday: Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 33. Wind chill values between 10 and 20. Very windy, with a north wind 35 to 40 mph decreasing to 28 to 33 mph in the afternoon. Winds could gust as high as 55 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    High: 33 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday Night

    Monday Night: Cloudy, then gradually becoming partly cloudy, with a low around 23. Wind chill values between 10 and 15. Blustery, with a northwest wind 18 to 25 mph.

    Low: 23 °F

    Decreasing
    Clouds and
    Blustery

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 11 to 13 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow after 1am. Increasing clouds, with a low around 19. West wind 5 to 9 mph becoming light and variable.

    Low: 19 °F

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: Rain and snow likely before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after noon. Mostly cloudy, with a high near 41. Chance of precipitation is 40%.

    High: 41 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

Detailed Forecast

Tonight
Snow. The snow could be heavy at times. Areas of blowing snow after 10pm. Low around 29. Wind chill values between 15 and 20. Very windy, with a north wind 26 to 31 mph increasing to 35 to 40 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 13 to 19 inches possible.
Monday
Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 33. Wind chill values between 10 and 20. Very windy, with a north wind 35 to 40 mph decreasing to 28 to 33 mph in the afternoon. Winds could gust as high as 55 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.
Monday Night
Cloudy, then gradually becoming partly cloudy, with a low around 23. Wind chill values between 10 and 15. Blustery, with a northwest wind 18 to 25 mph.
Tuesday
Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 11 to 13 mph.
Tuesday Night
A 40 percent chance of snow after 1am. Increasing clouds, with a low around 19. West wind 5 to 9 mph becoming light and variable.
Wednesday
Rain and snow likely before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
A chance of rain and snow after noon. Mostly cloudy, with a high near 41. Chance of precipitation is 40%.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 41.
Friday Night
Mostly clear, with a low around 29.
Saturday
Sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 42.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
5:56 pm EST Feb 22, 2026
Forecast Valid:
7pm EST Feb 22, 2026-6pm EST Mar 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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