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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 58. Calm wind becoming southwest 5 to 9 mph in the afternoon.

    High: 58 °F

    Areas Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 50 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 64. Light and variable wind becoming east 5 to 9 mph in the afternoon.

    High: 64 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 42. East wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 59. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy, then gradually becoming partly cloudy, with a low around 39.

    Low: 39 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

Today
Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 58. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Tonight
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Saturday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 64. Light and variable wind becoming east 5 to 9 mph in the afternoon.
Saturday Night
A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 42. East wind 6 to 9 mph, with gusts as high as 20 mph.
Sunday
Showers. High near 59. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy, then gradually becoming partly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 31.
Wednesday
Sunny, with a high near 47.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, 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, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
2:20 am EDT Apr 3, 2026
Forecast Valid:
8am EDT Apr 3, 2026-6pm EDT Apr 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