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.

Overcast

47°F

8°C

Humidity 83%
Wind Speed SW 15 G 25 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 26 Mar 5:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Today

    Today: A slight chance of rain before 8am, then a slight chance of showers after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 62. Southwest wind around 14 mph. Chance of precipitation is 20%.

    High: 62 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly after 11pm. Low around 45. South wind 13 to 17 mph becoming west after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers
    Likely then
    Showers

  • Friday

    Friday: Showers likely, mainly before 8am. Cloudy, with a steady temperature around 48. North wind 10 to 13 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A slight chance of rain before 11pm, then a slight chance of rain and snow between 11pm and 2am, then a chance of snow after 2am. Mostly cloudy, with a low around 31. Northeast wind 5 to 9 mph. Chance of precipitation is 30%.

    Low: 31 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: A 30 percent chance of snow before 8am. Mostly sunny, with a high near 42. North wind around 14 mph.

    High: 42 °F

    Chance Snow
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

Detailed Forecast

Today
A slight chance of rain before 8am, then a slight chance of showers after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 62. Southwest wind around 14 mph. Chance of precipitation is 20%.
Tonight
Showers, mainly after 11pm. Low around 45. South wind 13 to 17 mph becoming west after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers likely, mainly before 8am. Cloudy, with a steady temperature around 48. North wind 10 to 13 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A slight chance of rain before 11pm, then a slight chance of rain and snow between 11pm and 2am, then a chance of snow after 2am. Mostly cloudy, with a low around 31. Northeast wind 5 to 9 mph. Chance of precipitation is 30%.
Saturday
A 30 percent chance of snow before 8am. Mostly sunny, with a high near 42. North wind around 14 mph.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Mostly cloudy, with a high near 55.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 54.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 53.
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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:
5:42 am EDT Mar 26, 2026
Forecast Valid:
6am EDT Mar 26, 2026-6pm EDT Apr 1, 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