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.

A Few Clouds

37°F

3°C

Humidity 30%
Wind Speed N 13 G 29 mph
Barometer 30.41 in (1029.9 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 28 Mar 12:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 43. Northwest wind around 14 mph, with gusts as high as 26 mph.

    High: 43 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 29. Northwest wind 8 to 13 mph becoming light after midnight. Winds could gust as high as 24 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 47. Light south wind increasing to 11 to 16 mph in the morning.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 41. Southwest wind 13 to 16 mph.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 59. Southwest wind 11 to 14 mph.

    High: 59 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 63.

    High: 63 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Rain likely after 2pm. Partly sunny, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Mostly Sunny
    then Rain
    Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 43. Northwest wind around 14 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 29. Northwest wind 8 to 13 mph becoming light after midnight. Winds could gust as high as 24 mph.
Sunday
Mostly sunny, with a high near 47. Light south wind increasing to 11 to 16 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 41. Southwest wind 13 to 16 mph.
Monday
Mostly cloudy, with a high near 59. Southwest wind 11 to 14 mph.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 45.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Rain likely after 2pm. Partly sunny, with a high near 65. Chance of precipitation is 60%.
Wednesday Night
Rain likely, mainly before 2am. Cloudy, with a low around 42. Chance of precipitation is 70%.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 50.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 37. Chance of precipitation is 50%.
Friday
Rain and snow likely. Cloudy, with a high near 45. Chance of precipitation is 60%.
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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:
4:58 am EDT Mar 28, 2026
Forecast Valid:
1pm EDT Mar 28, 2026-6pm EDT Apr 3, 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