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

34°F

1°C

Humidity 100%
Wind Speed Calm
Barometer 30.03 in (1017.1 mb)
Dewpoint 34°F (1°C)
Visibility 9.00 mi
Last update 28 Feb 9:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Patchy fog between 11pm and 2am. Otherwise, mostly cloudy, with a low around 28. Calm wind becoming north around 5 mph.

    Low: 28 °F

    Patchy Fog

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, with a high near 36. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 36 °F

    Snow Likely

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 6 mph.

    Low: 15 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 28. Wind chill values between 5 and 15. North wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 20. Calm wind.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 41 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain. Low around 36. Chance of precipitation is 90%.

    Low: 36 °F

    Rain

  • Wednesday

    Wednesday: Cloudy, with a high near 46.

    High: 46 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy fog between 11pm and 2am. Otherwise, mostly cloudy, with a low around 28. Calm wind becoming north around 5 mph.
Sunday
Snow likely, mainly before 1pm. Cloudy, with a high near 36. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 6 mph.
Monday
Sunny, with a high near 28. Wind chill values between 5 and 15. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 20. Calm wind.
Tuesday
A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%. Little or no snow accumulation expected.
Tuesday Night
Rain. Low around 36. Chance of precipitation is 90%.
Wednesday
Cloudy, with a high near 46.
Wednesday Night
A 40 percent chance of rain. Cloudy, with a low around 35.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 50.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
A 40 percent chance of rain. Cloudy, with a high near 47.
Friday Night
A 30 percent chance of rain. Cloudy, with a low around 36.
Saturday
Mostly cloudy, with a high near 51.
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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:
6:27 pm EST Feb 28, 2026
Forecast Valid:
10pm EST Feb 28, 2026-6pm EST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation