National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

75°F

24°C

Humidity 55%
Wind Speed S 10 mph
Barometer 29.81 in (1009.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 Jun 12:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 77. South wind around 10 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 63. South wind around 8 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 68. Southwest wind 8 to 11 mph, with gusts as high as 22 mph.

    Low: 68 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 80. West wind 8 to 11 mph.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 77. South wind around 10 mph.
Tonight
Increasing clouds, with a low around 63. South wind around 8 mph.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a low around 68. Southwest wind 8 to 11 mph, with gusts as high as 22 mph.
Juneteenth
Mostly sunny, with a high near 80. West wind 8 to 11 mph.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 85.
Sunday Night
A 40 percent chance of showers after 2am. Partly cloudy, with a low around 64.
Monday
Showers likely. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Monday Night
Showers likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Tuesday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.77°N 73.21°W (Elev. 49 ft)
Last Update:
3:08 am EDT Jun 17, 2026
Forecast Valid:
1pm EDT Jun 17, 2026-6pm EDT Jun 23, 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