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

79°F

26°C

Humidity 49%
Wind Speed SW 18 G 30 mph
Barometer 29.58 in (1001.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 Jun 10:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 67. West wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 67 °F

    Mostly Cloudy

  • Juneteenth

    Juneteenth: Mostly cloudy, then gradually becoming sunny, with a high near 80. West wind 10 to 18 mph, with gusts as high as 30 mph.

    High: 80 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Clear, with a low around 64. West wind around 9 mph.

    Low: 64 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84. West wind around 17 mph, with gusts as high as 29 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. West wind around 6 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Showers, mainly after 8am. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Monday Night

    Monday Night: Showers, mainly before 2am. Low around 64. Chance of precipitation is 80%.

    Low: 64 °F

    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 67. West wind 9 to 11 mph, with gusts as high as 21 mph.
Juneteenth
Mostly cloudy, then gradually becoming sunny, with a high near 80. West wind 10 to 18 mph, with gusts as high as 30 mph.
Friday Night
Clear, with a low around 64. West wind around 9 mph.
Saturday
Sunny, with a high near 84. West wind around 17 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 64. West wind around 6 mph.
Sunday
Sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 64.
Monday
Showers, mainly after 8am. High near 78. Chance of precipitation is 80%.
Monday Night
Showers, mainly before 2am. Low around 64. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers before 2pm. Partly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 81.
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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:
4:34 pm EDT Jun 18, 2026
Forecast Valid:
11pm EDT Jun 18, 2026-6pm EDT Jun 25, 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