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.

Light Drizzle Fog/Mist

39°F

4°C

Humidity 93%
Wind Speed N 14 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 37°F (3°C)
Visibility 6.00 mi
Wind Chill31°F (-1°C)
Last update 23 Mar 11:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: A chance of rain before 2pm, then a slight chance of showers after 2pm. Cloudy, with a steady temperature around 41. North wind around 10 mph. Chance of precipitation is 50%.

    High: 41 °F

    Chance Rain

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 31. Northwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 46. North wind 5 to 8 mph.

    High: 46 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 34. Southwest wind around 6 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 50. South wind 5 to 11 mph.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely after 2am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.

    Low: 44 °F

    Mostly Cloudy
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%.

    High: 53 °F

    Rain Likely

Detailed Forecast

This Afternoon
A chance of rain before 2pm, then a slight chance of showers after 2pm. Cloudy, with a steady temperature around 41. North wind around 10 mph. Chance of precipitation is 50%.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 31. Northwest wind 6 to 9 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 46. North wind 5 to 8 mph.
Tuesday Night
Increasing clouds, with a low around 34. Southwest wind around 6 mph.
Wednesday
Partly sunny, with a high near 50. South wind 5 to 11 mph.
Wednesday Night
Mostly cloudy, with a low around 39.
Thursday
Mostly cloudy, with a high near 54.
Thursday Night
Rain likely after 2am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Sunny, with a high near 46.
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:
2:12 am EDT Mar 23, 2026
Forecast Valid:
12pm EDT Mar 23, 2026-6pm EDT Mar 29, 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