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.

Fair

37°F

3°C

Humidity 67%
Wind Speed SW 13 mph
Barometer 29.87 in (1011.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 10 Dec 2:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 40. Southwest wind around 11 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 48. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 33 mph.

    High: 48 °F

    Partly Sunny
    then Chance
    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain, mainly between 7pm and 10pm. Low around 29. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 29 °F

    Rain then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 38. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph.

    High: 38 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24. West wind 15 to 17 mph, with gusts as high as 34 mph.

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 40. Southwest wind around 11 mph, with gusts as high as 25 mph.
Wednesday
A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 48. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 33 mph.
Wednesday Night
Rain, mainly between 7pm and 10pm. Low around 29. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Mostly sunny, with a high near 38. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph.
Thursday Night
Partly cloudy, with a low around 24. West wind 15 to 17 mph, with gusts as high as 34 mph.
Friday
Mostly sunny, with a high near 36.
Friday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Saturday
Partly sunny, with a high near 41.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Sunday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 35.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Sunny, with a high near 31.
Monday Night
Mostly cloudy, with a low around 20.
Tuesday
Partly sunny, with a high near 34.
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:
2:32 am EST Dec 10, 2025
Forecast Valid:
3am EST Dec 10, 2025-6pm EST Dec 16, 2025
 
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