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.

Mostly Cloudy

30°F

-1°C

Humidity 72%
Wind Speed NW 12 mph
Barometer 29.84 in (1010.4 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 12 Feb 2:56 am EST
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: A 20 percent chance of snow showers before 4am. Partly cloudy, with a steady temperature around 28. Wind chill values between 15 and 20. Northwest wind around 11 mph, with gusts as high as 23 mph.

    Low: 28 °F

    Slight Chance
    Snow Showers

  • Thursday

    Thursday: Increasing clouds, with a high near 36. Wind chill values between 15 and 25. Northwest wind 11 to 15 mph, with gusts as high as 26 mph.

    High: 36 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 35. Wind chill values between 10 and 20. Northwest wind 6 to 10 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 25. West wind around 6 mph.

    Low: 25 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 40%.

    Low: 29 °F

    Chance
    Rain/Snow

Detailed Forecast

Overnight
A 20 percent chance of snow showers before 4am. Partly cloudy, with a steady temperature around 28. Wind chill values between 15 and 20. Northwest wind around 11 mph, with gusts as high as 23 mph.
Thursday
Increasing clouds, with a high near 36. Wind chill values between 15 and 25. Northwest wind 11 to 15 mph, with gusts as high as 26 mph.
Thursday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.
Friday
Sunny, with a high near 35. Wind chill values between 10 and 20. Northwest wind 6 to 10 mph.
Friday Night
A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 25. West wind around 6 mph.
Saturday
Mostly sunny, with a high near 40.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 40%.
Washington's Birthday
Mostly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 44.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
2:21 am EST Feb 12, 2026
Forecast Valid:
3am EST Feb 12, 2026-6pm EST Feb 18, 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