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.

Partly Cloudy

32°F

0°C

Humidity 69%
Wind Speed Calm
Barometer 30.07 in (1018.3 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 3 Dec 6:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly clear, with a low around 29. Calm wind becoming west 5 to 7 mph after midnight.

    Low: 29 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 40. Wind chill values between 25 and 30. West wind 8 to 14 mph, with gusts as high as 29 mph.

    High: 40 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 16. Northwest wind 5 to 14 mph, with gusts as high as 32 mph.

    Low: 16 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of light snow after 1pm. Increasing clouds, with a high near 35. Wind chill values between 15 and 25. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 35 °F

    Mostly Sunny
    then Chance
    Light Snow

  • Friday Night

    Friday Night: A chance of rain and snow before 10pm, then a chance of snow. Cloudy, with a low around 28. Light and variable wind. Chance of precipitation is 30%.

    Low: 28 °F

    Chance
    Rain/Snow
    then Chance
    Light Snow

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 40.

    High: 40 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 29. Calm wind becoming west 5 to 7 mph after midnight.
Thursday
Increasing clouds, with a high near 40. Wind chill values between 25 and 30. West wind 8 to 14 mph, with gusts as high as 29 mph.
Thursday Night
Mostly clear, with a low around 16. Northwest wind 5 to 14 mph, with gusts as high as 32 mph.
Friday
A 30 percent chance of light snow after 1pm. Increasing clouds, with a high near 35. Wind chill values between 15 and 25. Calm wind becoming southeast 5 to 7 mph in the morning.
Friday Night
A chance of rain and snow before 10pm, then a chance of snow. Cloudy, with a low around 28. Light and variable wind. Chance of precipitation is 30%.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 40.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Mostly sunny, with a high near 43.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 18.
Tuesday
Mostly sunny, with a high near 38.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
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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:
4:09 pm EST Dec 3, 2025
Forecast Valid:
7pm EST Dec 3, 2025-6pm EST Dec 10, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation