National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

27°F

-3°C

Humidity 66%
Wind Speed W 15 mph
Barometer 29.81 in (1009.4 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 24 Feb 5:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Patchy blowing snow before 7am. Mostly sunny, with a steady temperature around 25. Wind chill values between 10 and 20. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.

    High: 25 °F

    Patchy
    Blowing Snow
    then Partly
    Sunny

  • Tonight

    Tonight: Snow likely after 4am. Increasing clouds, with a temperature falling to near 19 by 10pm, then rising to around 32 during the remainder of the night. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    Low: 19 °F⇑

    Mostly Clear
    then Snow
    Likely

  • Wednesday

    Wednesday: Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 40. Southwest wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Southwest wind around 6 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of snow before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 38. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 50%.

    High: 38 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 27. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 27 °F

    Snow Likely

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy blowing snow before 7am. Mostly sunny, with a steady temperature around 25. Wind chill values between 10 and 20. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.
Tonight
Snow likely after 4am. Increasing clouds, with a temperature falling to near 19 by 10pm, then rising to around 32 during the remainder of the night. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Wednesday
Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 40. Southwest wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 29. Southwest wind around 6 mph.
Thursday
A slight chance of snow before 1pm, then a chance of rain and snow. Mostly cloudy, with a high near 38. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 50%.
Thursday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 27. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Mostly sunny, with a high near 37.
Friday Night
Mostly clear, with a low around 27.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Mostly sunny, with a high near 39.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 30.
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:
5:37 am EST Feb 24, 2026
Forecast Valid:
6am EST Feb 24, 2026-6pm EST Mar 2, 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