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

59°F

15°C

Humidity 58%
Wind Speed S 9 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 26 Mar 1:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 60. Southwest wind around 16 mph.

    High: 60 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly after 8pm. Steady temperature around 52. Breezy, with a south wind 17 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Breezy.
    Showers
    Likely then
    Showers

  • Friday

    Friday: Showers, mainly before 8am. Temperature falling to around 46 by 5pm. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F⇓

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 30. Northeast wind 5 to 7 mph.

    Low: 30 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 41. Northwest wind 11 to 14 mph.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 60. Southwest wind around 16 mph.
Tonight
Showers, mainly after 8pm. Steady temperature around 52. Breezy, with a south wind 17 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, mainly before 8am. Temperature falling to around 46 by 5pm. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Mostly cloudy, with a low around 30. Northeast wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 41. Northwest wind 11 to 14 mph.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Mostly sunny, with a high near 46.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 54.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 43.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
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
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:38 pm EDT Mar 26, 2026
Forecast Valid:
2pm EDT Mar 26, 2026-6pm EDT Apr 1, 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