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

63°F

17°C

Humidity 73%
Wind Speed SW 6 mph
Barometer 29.88 in (1011.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 15 Apr 1:56 am EDT
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 54. Southwest wind around 6 mph.

    Low: 54 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Light west wind becoming south 5 to 10 mph in the morning.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 54. Southwest wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    T-storms

  • Thursday

    Thursday: Partly sunny, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54. Southwest wind 5 to 8 mph.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers after 2pm. Partly sunny, with a high near 73.

    High: 73 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 54. Southwest wind around 6 mph.
Wednesday
Mostly sunny, with a high near 78. Light west wind becoming south 5 to 10 mph in the morning.
Wednesday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 54. Southwest wind 5 to 7 mph. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 77. South wind 5 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 54. Southwest wind 5 to 8 mph.
Friday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 73.
Friday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51.
Saturday
Partly sunny, with a high near 60.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 59. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Sunny, with a high near 53.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:33 am EDT Apr 15, 2026
Forecast Valid:
2am EDT Apr 15, 2026-6pm EDT Apr 21, 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