Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

51°F

11°C

Humidity 92%
Wind Speed SW 8 mph
Barometer 30.13 in (1020.4 mb)
Dewpoint 49°F (9°C)
Visibility 9.00 mi
Wind Chill48°F (9°C)
Last update 3 Apr 9:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Areas of fog.  Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 9 mph, with gusts as high as 21 mph.

    Low: 50 °F

    Areas Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm.  Patchy fog before 11am.  Otherwise, partly sunny, with a high near 63. Light and variable wind becoming east 5 to 10 mph in the afternoon.

    High: 63 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 8pm.  Cloudy, with a low around 41. East wind 6 to 11 mph, with gusts as high as 23 mph.

    Low: 41 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then showers after 2pm.  High near 59. Southwest wind 10 to 15 mph, with gusts as high as 28 mph.  Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 41. Northwest wind around 7 mph.

    Low: 41 °F

    Gradual
    Clearing

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Tonight
Areas of fog. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 9 mph, with gusts as high as 21 mph.
Saturday
A 20 percent chance of showers after 2pm. Patchy fog before 11am. Otherwise, partly sunny, with a high near 63. Light and variable wind becoming east 5 to 10 mph in the afternoon.
Saturday Night
A 40 percent chance of showers, mainly after 8pm. Cloudy, with a low around 41. East wind 6 to 11 mph, with gusts as high as 23 mph.
Sunday
Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then showers after 2pm. High near 59. Southwest wind 10 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 41. Northwest wind around 7 mph.
Monday
Sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 46.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 54.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 59.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
2:23 pm EDT Apr 3, 2026
10pm EDT Apr 3, 2026-6pm EDT Apr 10, 2026
 
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