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

42°F

6°C

Humidity 35%
Wind Speed N 16 mph
Barometer 30.39 in (1029.2 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 24 Mar 11:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 45. North wind 6 to 13 mph becoming west.

    High: 45 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 35. South wind 7 to 9 mph.

    Low: 35 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 50. South wind 5 to 8 mph.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 41. South wind 7 to 9 mph.

    Low: 41 °F

    Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 57. Southwest wind 8 to 14 mph.

    High: 57 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 52. Chance of precipitation is 60%.

    High: 52 °F

    Rain Likely

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 45. North wind 6 to 13 mph becoming west.
Tonight
Increasing clouds, with a low around 35. South wind 7 to 9 mph.
Wednesday
Partly sunny, with a high near 50. South wind 5 to 8 mph.
Wednesday Night
Cloudy, with a low around 41. South wind 7 to 9 mph.
Thursday
Mostly cloudy, with a high near 57. Southwest wind 8 to 14 mph.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 52. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Sunny, with a high near 42.
Saturday Night
Mostly clear, with a low around 32.
Sunday
Sunny, with a high near 48.
Sunday Night
Mostly cloudy, with a low around 37.
Monday
Partly sunny, with a high near 54.
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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:
10:58 am EDT Mar 24, 2026
Forecast Valid:
12pm EDT Mar 24, 2026-6pm EDT Mar 30, 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