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

39°F

4°C

Humidity 70%
Wind Speed SW 10 G 21 mph
Barometer 30.16 in (1021.5 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 21 Jan 10:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: A chance of rain and snow before 1am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 38. Southwest wind 11 to 13 mph. Chance of precipitation is 30%.

    Low: 38 °F

    Chance
    Rain/Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 43. West wind 11 to 15 mph.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26. Wind chill values between 15 and 20. West wind 10 to 13 mph.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 35. Wind chill values between 15 and 25. West wind 9 to 16 mph.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 11. Breezy, with a west wind 15 to 20 mph.

    Low: 11 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: Snow likely after 1am. Mostly cloudy, with a low around 11. Chance of precipitation is 60%.

    Low: 11 °F

    Mostly Cloudy
    then Snow
    Likely

  • Sunday

    Sunday: Snow. High near 24. Chance of precipitation is 90%.

    High: 24 °F

    Snow

  • Sunday Night

    Sunday Night: Snow. Low around 19. Chance of precipitation is 80%.

    Low: 19 °F

    Snow

Detailed Forecast

Tonight
A chance of rain and snow before 1am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 38. Southwest wind 11 to 13 mph. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 43. West wind 11 to 15 mph.
Thursday Night
Partly cloudy, with a low around 26. Wind chill values between 15 and 20. West wind 10 to 13 mph.
Friday
Partly sunny, with a high near 35. Wind chill values between 15 and 25. West wind 9 to 16 mph.
Friday Night
Partly cloudy, with a low around 11. Breezy, with a west wind 15 to 20 mph.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
Snow likely after 1am. Mostly cloudy, with a low around 11. Chance of precipitation is 60%.
Sunday
Snow. High near 24. Chance of precipitation is 90%.
Sunday Night
Snow. Low around 19. Chance of precipitation is 80%.
Monday
A 50 percent chance of snow. Mostly cloudy, with a high near 27.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 14.
Wednesday
Partly sunny, with a high near 27.
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:
6:01 pm EST Jan 21, 2026
Forecast Valid:
11pm EST Jan 21, 2026-6pm EST Jan 28, 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