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.

A Few Clouds

27°F

-3°C

Humidity 43%
Wind Speed Calm
Barometer 30.25 in (1024.5 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Last update 9 Dec 9:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Increasing clouds, with a high near 36. Wind chill values between 25 and 30. Light and variable wind becoming southwest 5 to 7 mph in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 35 by 10pm. Wind chill values between 25 and 30. Southwest wind 8 to 10 mph, with gusts as high as 23 mph.

    Low: 31 °F⇑

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. Southwest wind 11 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 49 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 9 to 14 mph, with gusts as high as 28 mph.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 39. West wind 10 to 16 mph, with gusts as high as 29 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.

    Low: 27 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 36. Wind chill values between 25 and 30. Light and variable wind becoming southwest 5 to 7 mph in the afternoon.
Tonight
Mostly cloudy, with a temperature rising to around 35 by 10pm. Wind chill values between 25 and 30. Southwest wind 8 to 10 mph, with gusts as high as 23 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. Southwest wind 11 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 9 to 14 mph, with gusts as high as 28 mph.
Thursday
Mostly sunny, with a high near 39. West wind 10 to 16 mph, with gusts as high as 29 mph.
Thursday Night
Partly cloudy, with a low around 26.
Friday
Mostly sunny, with a high near 38.
Friday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 40.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 25.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 35.
Sunday Night
Partly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
5:28 am EST Dec 9, 2025
Forecast Valid:
10am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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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