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.

Partly Cloudy

72°F

22°C

Humidity 68%
Wind Speed NW 8 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 26 Aug 9:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Sunny, with a high near 79. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.

    High: 79 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 68. South wind around 8 mph.

    Low: 68 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 80. South wind 9 to 16 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 68. South wind 6 to 13 mph. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 79. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.
Tonight
Increasing clouds, with a low around 68. South wind around 8 mph.
Thursday
A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 80. South wind 9 to 16 mph. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 68. South wind 6 to 13 mph. Chance of precipitation is 50%.
Friday
A slight chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
Sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
Partly sunny, with a high near 83.
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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:
2:49 am EDT Aug 26, 2026
Forecast Valid:
10am EDT Aug 26, 2026-6pm EDT Sep 1, 2026
 
Forecast Discussion
 
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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