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.

A Few Clouds

45°F

7°C

Humidity 33%
Wind Speed NW 17 mph
Barometer 30.20 in (1022.6 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 27 Mar 12:56 pm EDT
Extended Forecast for

Stony Brook NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 51. West wind around 13 mph, with gusts as high as 23 mph.

    High: 51 °F

    Sunny

  • Tonight

    Tonight: A slight chance of rain showers after 11pm, mixing with snow after 2am. Increasing clouds, with a low around 39. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    Showers then
    Slight Chance
    Rain/Snow

  • Friday

    Friday: Partly sunny, with a high near 60. West wind 8 to 10 mph.

    High: 60 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 45. South wind around 6 mph.

    Low: 45 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 74. Southwest wind 9 to 15 mph, with gusts as high as 25 mph.

    High: 74 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers. Cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Mostly cloudy, with a high near 63.

    High: 63 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 51. West wind around 13 mph, with gusts as high as 23 mph.
Tonight
A slight chance of rain showers after 11pm, mixing with snow after 2am. Increasing clouds, with a low around 39. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Friday
Partly sunny, with a high near 60. West wind 8 to 10 mph.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 45. South wind around 6 mph.
Saturday
Partly sunny, with a high near 74. Southwest wind 9 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly cloudy, with a low around 44.
Sunday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 55.
Sunday Night
A 40 percent chance of showers. Cloudy, with a low around 46.
Monday
A 40 percent chance of showers. Mostly cloudy, with a high near 63.
Monday Night
Showers likely before 2am. Mostly cloudy, with a low around 39. Chance of precipitation is 70%.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 48.
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
10:25 am EDT Mar 27, 2025
Forecast Valid:
1pm EDT Mar 27, 2025-6pm EDT Apr 2, 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