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.

Partly Cloudy

57°F

14°C

Humidity 51%
Wind Speed Calm
Barometer 30.31 in (1026.2 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 11 May 10:56 pm EDT
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Clear, with a low around 48. East wind 3 to 5 mph.

    Low: 48 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 72. East wind 6 to 11 mph becoming south in the afternoon.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. South wind 5 to 9 mph becoming calm after midnight.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers. Mostly cloudy, with a high near 69. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 69 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Cloudy, with a low around 58. Southeast wind around 8 mph.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 67 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely. Cloudy, with a low around 59. Chance of precipitation is 70%.

    Low: 59 °F

    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 70.

    High: 70 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 48. East wind 3 to 5 mph.
Monday
Sunny, with a high near 72. East wind 6 to 11 mph becoming south in the afternoon.
Monday Night
Partly cloudy, with a low around 54. South wind 5 to 9 mph becoming calm after midnight.
Tuesday
A 30 percent chance of showers. Mostly cloudy, with a high near 69. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Tuesday Night
A 50 percent chance of showers. Cloudy, with a low around 58. Southeast wind around 8 mph.
Wednesday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Showers likely. Cloudy, with a low around 59. Chance of precipitation is 70%.
Thursday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 70.
Thursday Night
Mostly cloudy, with a low around 59.
Friday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 74.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 60.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 78.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 60.
Sunday
Mostly sunny, with a high near 75.
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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:
10:34 pm EDT May 11, 2025
Forecast Valid:
11pm EDT May 11, 2025-6pm EDT May 18, 2025
 
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