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.

A Few Clouds

30°F

-1°C

Humidity 54%
Wind Speed NW 9 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 13 Mar 5:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 46. Wind chill values between 20 and 30 early. Northwest wind 7 to 14 mph becoming south in the afternoon.

    High: 46 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 15 to 18 mph, with gusts as high as 28 mph.

    Low: 37 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 48. Breezy, with a west wind 16 to 25 mph.

    High: 48 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Northwest wind 5 to 11 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 47. Northeast wind 5 to 13 mph becoming southeast in the afternoon.

    High: 47 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 50 percent chance of rain after 2am. Cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 8am. High near 56. Breezy. Chance of precipitation is 90%.

    High: 56 °F

    Rain and
    Breezy

  • Monday Night

    Monday Night: Rain. Low around 37. Windy. Chance of precipitation is 90%.

    Low: 37 °F

    Rain and
    Windy

  • Tuesday

    Tuesday: Rain likely before 8am. Mostly sunny, with a high near 46. Chance of precipitation is 60%.

    High: 46 °F

    Rain Likely
    then Mostly
    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 46. Wind chill values between 20 and 30 early. Northwest wind 7 to 14 mph becoming south in the afternoon.
Tonight
A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 15 to 18 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 48. Breezy, with a west wind 16 to 25 mph.
Saturday Night
Increasing clouds, with a low around 32. Northwest wind 5 to 11 mph.
Sunday
Mostly cloudy, with a high near 47. Northeast wind 5 to 13 mph becoming southeast in the afternoon.
Sunday Night
A 50 percent chance of rain after 2am. Cloudy, with a low around 39.
Monday
Rain, with thunderstorms also possible after 8am. High near 56. Breezy. Chance of precipitation is 90%.
Monday Night
Rain. Low around 37. Windy. Chance of precipitation is 90%.
Tuesday
Rain likely before 8am. Mostly sunny, with a high near 46. Chance of precipitation is 60%.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 43.
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:
6:18 am EDT Mar 13, 2026
Forecast Valid:
6am EDT Mar 13, 2026-6pm EDT Mar 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