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

42°F

6°C

Humidity 38%
Wind Speed NW 16 G 28 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 4 Dec 3:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Partly cloudy, with a low around 17. North wind 5 to 14 mph, with gusts as high as 28 mph.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Increasing clouds, with a high near 36. Wind chill values between 10 and 20. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A chance of snow before 1am, then a chance of rain. Cloudy, with a steady temperature around 32. Calm wind. Chance of precipitation is 40%.

    Low: 32 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Saturday

    Saturday: A 20 percent chance of rain before 1pm. Mostly cloudy, with a high near 43. Calm wind becoming west 5 to 8 mph in the morning.

    High: 43 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. West wind around 5 mph.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 17. North wind 5 to 14 mph, with gusts as high as 28 mph.
Friday
Increasing clouds, with a high near 36. Wind chill values between 10 and 20. Calm wind becoming southeast around 6 mph in the afternoon.
Friday Night
A chance of snow before 1am, then a chance of rain. Cloudy, with a steady temperature around 32. Calm wind. Chance of precipitation is 40%.
Saturday
A 20 percent chance of rain before 1pm. Mostly cloudy, with a high near 43. Calm wind becoming west 5 to 8 mph in the morning.
Saturday Night
Partly cloudy, with a low around 28. West wind around 5 mph.
Sunday
Partly sunny, with a high near 42.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 36.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Partly sunny, with a high near 40.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 34.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 45.
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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:
2:14 pm EST Dec 4, 2025
Forecast Valid:
4pm EST Dec 4, 2025-6pm EST Dec 11, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation