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.

Mostly Cloudy

61°F

16°C

Humidity 65%
Wind Speed S 14 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 31 Mar 3:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 52. Southwest wind 14 to 18 mph, with gusts as high as 29 mph.

    Low: 52 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 71. Southwest wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    High: 71 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before midnight, then showers likely. Low around 41. Calm wind becoming east 5 to 9 mph after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Showers

  • Thursday

    Thursday: A 30 percent chance of light rain, mainly before noon. Patchy fog before noon. Otherwise, cloudy, with a high near 46. East wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 46 °F

    Chance Light
    Rain and
    Patchy Fog

  • Thursday Night

    Thursday Night: A 20 percent chance of light rain after 8pm. Areas of fog after midnight. Otherwise, cloudy, with a low around 39. East wind 5 to 8 mph.

    Low: 39 °F

    Slight Chance
    Light Rain
    and Areas Fog

  • Friday

    Friday: Areas of fog before noon. Otherwise, mostly cloudy, with a high near 59.

    High: 59 °F

    Areas Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 52. Southwest wind 14 to 18 mph, with gusts as high as 29 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 71. Southwest wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Wednesday Night
Showers and possibly a thunderstorm before midnight, then showers likely. Low around 41. Calm wind becoming east 5 to 9 mph after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of light rain, mainly before noon. Patchy fog before noon. Otherwise, cloudy, with a high near 46. East wind 11 to 14 mph, with gusts as high as 24 mph.
Thursday Night
A 20 percent chance of light rain after 8pm. Areas of fog after midnight. Otherwise, cloudy, with a low around 39. East wind 5 to 8 mph.
Friday
Areas of fog before noon. Otherwise, mostly cloudy, with a high near 59.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 48.
Sunday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 60. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 51.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
2:28 pm EDT Mar 31, 2026
Forecast Valid:
4pm EDT Mar 31, 2026-6pm EDT Apr 7, 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