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.

Overcast

41°F

5°C

Humidity 89%
Wind Speed E 5 mph
Barometer 30.08 in (1018.8 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 7 Apr 1:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 30 percent chance of showers. Mostly cloudy, with a low around 39. Light southeast wind.

    Low: 39 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 52. Northwest wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 52 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30. Wind chill values between 20 and 25. North wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 7 to 9 mph becoming east in the afternoon.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 33. Southeast wind around 6 mph becoming calm in the evening.

    Low: 33 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers. Mostly cloudy, with a low around 39. Light southeast wind.
Tuesday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 52. Northwest wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 30. Wind chill values between 20 and 25. North wind 11 to 13 mph, with gusts as high as 23 mph.
Wednesday
Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 7 to 9 mph becoming east in the afternoon.
Wednesday Night
Mostly clear, with a low around 33. Southeast wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 50.
Thursday Night
Partly cloudy, with a low around 41.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 58.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
Partly sunny, with a high near 64.
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:
8:00 pm EDT Apr 6, 2026
Forecast Valid:
2am EDT Apr 7, 2026-6pm EDT Apr 13, 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