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.

Mostly Cloudy

28°F

-2°C

Humidity 43%
Wind Speed Calm
Barometer 30.15 in (1021.1 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 10 Feb 9:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Today

    Today: A slight chance of snow between 1pm and 4pm. Mostly cloudy, with a high near 34. South wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 34 °F

    Slight Chance
    Snow

  • Tonight

    Tonight: Rain and sleet, mainly before 1am. Low around 30. South wind around 6 mph becoming west after midnight. Chance of precipitation is 80%. Little or no sleet accumulation expected.

    Low: 30 °F

    Rain/Sleet

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Wind chill values between 25 and 30. West wind 10 to 14 mph, with gusts as high as 25 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 26. Wind chill values between 15 and 20. West wind around 14 mph, with gusts as high as 24 mph.

    Low: 26 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 34. Northwest wind 11 to 14 mph.

    High: 34 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of snow between 1pm and 4pm. Mostly cloudy, with a high near 34. South wind 3 to 6 mph. Chance of precipitation is 20%.
Tonight
Rain and sleet, mainly before 1am. Low around 30. South wind around 6 mph becoming west after midnight. Chance of precipitation is 80%. Little or no sleet accumulation expected.
Wednesday
Mostly sunny, with a high near 38. Wind chill values between 25 and 30. West wind 10 to 14 mph, with gusts as high as 25 mph.
Wednesday Night
Partly cloudy, with a low around 26. Wind chill values between 15 and 20. West wind around 14 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 34. Northwest wind 11 to 14 mph.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
Sunny, with a high near 34.
Friday Night
Mostly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 37.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Rain and snow likely. Cloudy, with a low around 31. Chance of precipitation is 60%.
Washington's Birthday
A 50 percent chance of rain. Cloudy, with a high near 40.
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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:
9:52 am EST Feb 10, 2026
Forecast Valid:
11am EST Feb 10, 2026-6pm EST Feb 16, 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