Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

31°F

-1°C

Humidity 76%
Wind Speed W 6 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 3 Dec 11:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly clear, with a low around 29. Southwest wind 3 to 6 mph.

    Low: 29 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 43. Wind chill values between 20 and 30. West wind 11 to 18 mph, with gusts as high as 32 mph.

    High: 43 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 7 to 17 mph, with gusts as high as 34 mph.

    Low: 18 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of light snow after 1pm.  Increasing clouds, with a high near 35. Wind chill values between 10 and 20. North wind 5 to 9 mph becoming south in the afternoon.

    High: 35 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A chance of snow before 4am, then a chance of rain.  Cloudy, with a low around 28. South wind around 6 mph becoming light and variable  in the evening.  Chance of precipitation is 30%.

    Low: 28 °F

    Chance Light
    Snow then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain or light rain before 7am, then a chance of rain between 7am and 1pm.  Partly sunny, with a high near 42. Chance of precipitation is 30%.

    High: 42 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 29. Southwest wind 3 to 6 mph.
Thursday
Increasing clouds, with a high near 43. Wind chill values between 20 and 30. West wind 11 to 18 mph, with gusts as high as 32 mph.
Thursday Night
Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 7 to 17 mph, with gusts as high as 34 mph.
Friday
A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 35. Wind chill values between 10 and 20. North wind 5 to 9 mph becoming south in the afternoon.
Friday Night
A chance of snow before 4am, then a chance of rain. Cloudy, with a low around 28. South wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 30%.
Saturday
A chance of rain or light rain before 7am, then a chance of rain between 7am and 1pm. Partly sunny, with a high near 42. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 44.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 38.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
10:39 pm EST Dec 3, 2025
12am EST Dec 4, 2025-6pm EST Dec 10, 2025
 
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