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

34°F

1°C

Humidity 89%
Wind Speed E 15 mph
Barometer 30.10 in (1019.3 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 22 Feb 6:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Blizzard Warning February 22, 01:00pm 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
Coastal Flood Warning

  • Today

    Today: Snow, mainly after 4pm. High near 36. Wind chill values between 20 and 25. Breezy, with an east wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Chance of precipitation is 90%. Total daytime snow accumulation of 1 to 2 inches possible.

    High: 36 °F

    Chance Snow
    then Snow and
    Breezy

  • Tonight

    Tonight: Snow. The snow could be heavy at times. Areas of blowing snow. Steady temperature around 32. Wind chill values between 15 and 20. Very windy, with a northeast wind 28 to 33 mph increasing to 36 to 41 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 12 to 18 inches possible.

    Low: 32 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday

    Monday: Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow before 4pm. High near 33. Wind chill values between 15 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: A 30 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 23. Wind chill values between 10 and 20. Windy, with a northwest wind 18 to 26 mph.

    Low: 23 °F

    Chance Snow
    and Windy
    then Mostly
    Cloudy and
    Blustery

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. West wind 14 to 16 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of snow after 1am. Increasing clouds, with a low around 20.

    Low: 20 °F

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: A chance of snow before 8am, then a chance of rain and snow between 8am and 1pm, then a chance of rain after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 38. Chance of precipitation is 50%.

    High: 38 °F

    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain. Partly cloudy, with a low around 31.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: A 50 percent chance of rain. Mostly cloudy, with a high near 40.

    High: 40 °F

    Chance Rain

Detailed Forecast

Today
Snow, mainly after 4pm. High near 36. Wind chill values between 20 and 25. Breezy, with an east wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Chance of precipitation is 90%. Total daytime snow accumulation of 1 to 2 inches possible.
Tonight
Snow. The snow could be heavy at times. Areas of blowing snow. Steady temperature around 32. Wind chill values between 15 and 20. Very windy, with a northeast wind 28 to 33 mph increasing to 36 to 41 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 12 to 18 inches possible.
Monday
Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow before 4pm. High near 33. Wind chill values between 15 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
A 30 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 23. Wind chill values between 10 and 20. Windy, with a northwest wind 18 to 26 mph.
Tuesday
Mostly sunny, with a high near 30. West wind 14 to 16 mph.
Tuesday Night
A 30 percent chance of snow after 1am. Increasing clouds, with a low around 20.
Wednesday
A chance of snow before 8am, then a chance of rain and snow between 8am and 1pm, then a chance of rain after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 38. Chance of precipitation is 50%.
Wednesday Night
A 30 percent chance of rain. Partly cloudy, with a low around 31.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 40.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 31.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 38.
Friday Night
Mostly clear, with a low around 27.
Saturday
Mostly sunny, with a high near 41.
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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:
5:57 am EST Feb 22, 2026
Forecast Valid:
7am EST Feb 22, 2026-6pm EST Feb 28, 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