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

44°F

7°C

Humidity 76%
Wind Speed W 12 mph
Barometer 29.39 in (995.1 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 15 Jan 8:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Partly sunny, with a temperature falling to around 35 by 5pm. West wind 9 to 14 mph, with gusts as high as 28 mph.

    High: 43 °F⇓

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 21. Wind chill values between 10 and 20. West wind 11 to 14 mph, with gusts as high as 30 mph.

    Low: 21 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 31 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 30. Southwest wind around 7 mph.

    Low: 30 °F

    Partly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of snow before 10am, then a chance of rain. Mostly cloudy, with a high near 43. Southwest wind 5 to 9 mph. Chance of precipitation is 40%.

    High: 43 °F

    Chance
    Rain/Snow
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 40 percent chance of snow. Mostly cloudy, with a high near 37.

    High: 37 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a temperature falling to around 35 by 5pm. West wind 9 to 14 mph, with gusts as high as 28 mph.
Tonight
Mostly cloudy, with a low around 21. Wind chill values between 10 and 20. West wind 11 to 14 mph, with gusts as high as 30 mph.
Friday
Sunny, with a high near 36. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 31 mph.
Friday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 30. Southwest wind around 7 mph.
Saturday
A chance of snow before 10am, then a chance of rain. Mostly cloudy, with a high near 43. Southwest wind 5 to 9 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 29.
Sunday
A 40 percent chance of snow. Mostly cloudy, with a high near 37.
Sunday Night
Mostly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Mostly sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
5:52 am EST Jan 15, 2026
Forecast Valid:
9am EST Jan 15, 2026-6pm EST Jan 21, 2026
 
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