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.

A Few Clouds

34°F

1°C

Humidity 82%
Wind Speed SW 7 mph
Barometer 29.72 in (1006.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 25 Feb 8:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Partly cloudy, with a low around 31. South wind 7 to 9 mph becoming west after midnight.

    Low: 31 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 4pm. Mostly sunny, with a high near 37. Wind chill values between 25 and 30. West wind 5 to 7 mph.

    High: 37 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. Light and variable wind.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 38. Calm wind becoming south around 5 mph.

    High: 38 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a steady temperature around 33. Light south wind.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 29.

    Low: 29 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 31. South wind 7 to 9 mph becoming west after midnight.
Thursday
A 20 percent chance of snow after 4pm. Mostly sunny, with a high near 37. Wind chill values between 25 and 30. West wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 25. Light and variable wind.
Friday
Sunny, with a high near 38. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a steady temperature around 33. Light south wind.
Saturday
Mostly sunny, with a high near 44.
Saturday Night
Increasing clouds, with a low around 29.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Partly cloudy, with a low around 20.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 27.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 18.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 35. Chance of precipitation is 40%.
Tuesday Night
Rain and snow likely. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 40.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
5:43 pm EST Feb 25, 2026
Forecast Valid:
9pm EST Feb 25, 2026-6pm EST Mar 4, 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