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

78°F

26°C

Humidity 47%
Wind Speed N 3 mph
Barometer 30.07 in (1017.9 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 18 Jul 7:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 66. Light north wind.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 84. East wind 5 to 10 mph becoming south in the afternoon.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 11pm. Increasing clouds, with a low around 74. South wind 7 to 9 mph. Chance of precipitation is 50%.

    Low: 74 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 7 to 11 mph.

    High: 87 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 71. North wind around 7 mph.

    Low: 71 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 66. Light north wind.
Saturday
Sunny, with a high near 84. East wind 5 to 10 mph becoming south in the afternoon.
Saturday Night
A chance of showers, with thunderstorms also possible after 11pm. Increasing clouds, with a low around 74. South wind 7 to 9 mph. Chance of precipitation is 50%.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 7 to 11 mph.
Sunday Night
Partly cloudy, with a low around 71. North wind around 7 mph.
Monday
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
Partly sunny, with a high near 88.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 76.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
1:40 pm EDT Jul 18, 2025
Forecast Valid:
8pm EDT Jul 18, 2025-6pm EDT Jul 25, 2025
 
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