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

66°F

19°C

Humidity 87%
Wind Speed SW 12 G 24 mph
Barometer 29.89 in (1011.9 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 13 Oct 8:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly clear, with a low around 64. Southwest wind around 10 mph, with gusts as high as 22 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. West wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53. North wind around 7 mph.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 64. North wind 6 to 8 mph.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely after 2am. Increasing clouds, with a low around 52. Southeast wind 3 to 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 52 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers. High near 72. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 72 °F

    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 43. Breezy.

    Low: 43 °F

    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 53. Breezy.

    High: 53 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 64. Southwest wind around 10 mph, with gusts as high as 22 mph.
Wednesday
Mostly sunny, with a high near 80. West wind 8 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 53. North wind around 7 mph.
Thursday
Sunny, with a high near 64. North wind 6 to 8 mph.
Thursday Night
Showers likely after 2am. Increasing clouds, with a low around 52. Southeast wind 3 to 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers. High near 72. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 30 percent chance of showers before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 43. Breezy.
Saturday
Sunny, with a high near 53. Breezy.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 44.
Monday
Mostly sunny, with a high near 63.
Monday Night
Mostly cloudy, with a low around 49.
Tuesday
Mostly sunny, with a high near 66.
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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:
2:19 pm EDT Oct 13, 2026
Forecast Valid:
9pm EDT Oct 13, 2026-6pm EDT Oct 20, 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