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.

Partly Cloudy

51°F

11°C

Humidity 35%
Wind Speed S 15 mph
Barometer 30.47 in (1031.7 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 12 Apr 2:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. South wind 8 to 10 mph.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 67. Southwest wind 14 to 17 mph, with gusts as high as 28 mph.

    High: 67 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53. Southwest wind 8 to 13 mph.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72. South wind 6 to 11 mph.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 7 to 10 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. South wind 8 to 10 mph.
Monday
Mostly cloudy, with a high near 67. Southwest wind 14 to 17 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 53. Southwest wind 8 to 13 mph.
Tuesday
Mostly sunny, with a high near 72. South wind 6 to 11 mph.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 7 to 10 mph.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 67.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 50.
Sunday
Mostly cloudy, with a high near 65.
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
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
2:33 pm EDT Apr 12, 2026
Forecast Valid:
3pm EDT Apr 12, 2026-6pm EDT Apr 19, 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