Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

37°F

3°C

Humidity 73%
Wind Speed SW 12 mph
Barometer 29.64 in (1003.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 25 Feb 2:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Partly cloudy, with a low around 29. Southwest wind around 6 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 1pm.  Partly sunny, with a high near 38. Northwest wind around 5 mph becoming calm  in the afternoon.

    High: 38 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 23. Calm wind.

    Low: 23 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 38. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.

    High: 38 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 28.

    Low: 28 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 29. Southwest wind around 6 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of snow after 1pm. Partly sunny, with a high near 38. Northwest wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 23. Calm wind.
Friday
Sunny, with a high near 38. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 29. Calm wind.
Saturday
Mostly sunny, with a high near 45.
Saturday Night
Increasing clouds, with a low around 28.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Partly cloudy, with a low around 19.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 28.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 17.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 40%.
Tuesday Night
Snow likely. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 40.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
12:43 pm EST Feb 25, 2026
3pm EST Feb 25, 2026-6pm EST Mar 4, 2026
 
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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