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.

Fair

28°F

-2°C

Humidity 58%
Wind Speed Calm
Barometer 30.55 in (1034.4 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 29 Mar 1:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50. Southwest wind 5 to 14 mph.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 42. South wind 13 to 15 mph.

    Low: 42 °F

    Increasing
    Clouds

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 58. Southwest wind around 15 mph.

    High: 58 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 49. Southwest wind 8 to 11 mph. Chance of precipitation is 20%.

    Low: 49 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers after 2pm. Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 45. Chance of precipitation is 70%.

    Low: 45 °F

    Rain Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 28. Calm wind.
Sunday
Mostly sunny, with a high near 50. Southwest wind 5 to 14 mph.
Sunday Night
Increasing clouds, with a low around 42. South wind 13 to 15 mph.
Monday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 58. Southwest wind around 15 mph.
Monday Night
A slight chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 49. Southwest wind 8 to 11 mph. Chance of precipitation is 20%.
Tuesday
Partly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
A 50 percent chance of showers after 2pm. Mostly sunny, with a high near 69.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 45. Chance of precipitation is 70%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 52.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 41.
Friday
Rain likely. Cloudy, with a high near 52. Chance of precipitation is 60%.
Friday Night
Rain likely. Cloudy, with a low around 42. Chance of precipitation is 60%.
Saturday
A 40 percent chance of rain. Cloudy, with a high near 51.
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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:
2:25 am EDT Mar 29, 2026
Forecast Valid:
2am EDT Mar 29, 2026-6pm EDT Apr 4, 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