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

54°F

12°C

Humidity 62%
Wind Speed NW 16 G 29 mph
Barometer 29.78 in (1008.2 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 7 Nov 4:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: A slight chance of showers between 1am and 4am. Partly cloudy, with a low around 44. Northwest wind 15 to 18 mph. Chance of precipitation is 20%.

    Low: 44 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 62. West wind 13 to 17 mph, with gusts as high as 28 mph.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. West wind 13 to 15 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 58. West wind 13 to 16 mph, with gusts as high as 28 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. Northwest wind 8 to 13 mph.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 1am and 4am. Partly cloudy, with a low around 44. Northwest wind 15 to 18 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 62. West wind 13 to 17 mph, with gusts as high as 28 mph.
Sunday Night
Mostly clear, with a low around 44. West wind 13 to 15 mph.
Monday
Mostly sunny, with a high near 58. West wind 13 to 16 mph, with gusts as high as 28 mph.
Monday Night
Mostly clear, with a low around 41. Northwest wind 8 to 13 mph.
Tuesday
Mostly sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 44.
Veterans Day
Sunny, with a high near 60.
Wednesday Night
Mostly cloudy, with a low around 41.
Thursday
A 30 percent chance of rain after 1pm. Partly sunny, with a high near 56.
Thursday Night
Rain likely. Mostly cloudy, with a low around 38. Breezy. Chance of precipitation is 60%.
Friday
Rain likely. Partly sunny, with a high near 51. Breezy. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 34.
Saturday
Mostly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
4:00 pm EST Nov 7, 2026
Forecast Valid:
5pm EST Nov 7, 2026-6pm EST Nov 14, 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