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

27°F

-3°C

Humidity 46%
Wind Speed S 7 mph
Barometer 30.64 in (1037.8 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 2 Mar 5:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Increasing clouds, with a low around 23. Calm wind.

    Low: 23 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A chance of snow before 9am, then rain. High near 39. East wind 3 to 8 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 39 °F

    Rain/Snow
    then Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 37. Light and variable wind becoming southwest around 6 mph in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 37 °F

    Rain

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 46. Light and variable wind.

    High: 46 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain, mainly after 1am. Mostly cloudy, with a low around 36. Calm wind.

    Low: 36 °F

    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain before 1pm. Cloudy, with a high near 46.

    High: 46 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

  • Friday

    Friday: A 50 percent chance of rain before 1pm. Cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 23. Calm wind.
Tuesday
A chance of snow before 9am, then rain. High near 39. East wind 3 to 8 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Tuesday Night
Rain. Low around 37. Light and variable wind becoming southwest around 6 mph in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 46. Light and variable wind.
Wednesday Night
A 40 percent chance of rain, mainly after 1am. Mostly cloudy, with a low around 36. Calm wind.
Thursday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 46.
Thursday Night
Rain likely, mainly after 1am. Cloudy, with a low around 37. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain before 1pm. Cloudy, with a high near 45.
Friday Night
Mostly cloudy, with a low around 35.
Saturday
Mostly cloudy, with a high near 49.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 41.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 55.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 42.
Monday
Mostly cloudy, with a high near 54.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:04 pm EST Mar 2, 2026
Forecast Valid:
6pm EST Mar 2, 2026-6pm EDT Mar 9, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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