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

34°F

1°C

Humidity 85%
Wind Speed Calm
Barometer 29.75 in (1007.3 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 10 Feb 11:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Rain, mainly before 4am. Low around 29. Southwest wind 3 to 6 mph. Chance of precipitation is 90%.

    Low: 29 °F

    Rain

  • Wednesday

    Wednesday: Sunny, with a high near 39. Breezy, with a west wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 39 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind around 18 mph, with gusts as high as 29 mph.

    Low: 25 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 35. Wind chill values between 15 and 25. Breezy, with a northwest wind 17 to 21 mph, with gusts as high as 31 mph.

    High: 35 °F

    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Northwest wind 10 to 17 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Friday Night

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

    Low: 25 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

Detailed Forecast

Overnight
Rain, mainly before 4am. Low around 29. Southwest wind 3 to 6 mph. Chance of precipitation is 90%.
Wednesday
Sunny, with a high near 39. Breezy, with a west wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph.
Wednesday Night
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind around 18 mph, with gusts as high as 29 mph.
Thursday
Sunny, with a high near 35. Wind chill values between 15 and 25. Breezy, with a northwest wind 17 to 21 mph, with gusts as high as 31 mph.
Thursday Night
Partly cloudy, with a low around 19. Northwest wind 10 to 17 mph.
Friday
Sunny, with a high near 34.
Friday Night
Mostly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly clear, with a low around 25.
Sunday
Partly sunny, with a high near 38.
Sunday Night
A chance of rain and snow. Cloudy, with a low around 28. Chance of precipitation is 40%.
Washington's Birthday
A chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 40%.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 41.
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:
1:06 pm EST Feb 10, 2026
Forecast Valid:
12am EST Feb 11, 2026-6pm EST Feb 17, 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