Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

69°F

21°C

Humidity 73%
Wind Speed S 6 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 29 Aug 5:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A slight chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 11am, then a slight chance of showers and thunderstorms after 11am.  Mostly sunny, with a high near 77. Southwest wind 6 to 13 mph.  Chance of precipitation is 20%.

    High: 77 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 56. West wind around 6 mph becoming north in the evening.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 76. Northwest wind around 7 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 58. West wind around 5 mph becoming light and variable  in the evening.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77. North wind around 6 mph.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Labor Day

    Labor Day: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 11am, then a slight chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 77. Southwest wind 6 to 13 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 56. West wind around 6 mph becoming north in the evening.
Saturday
Sunny, with a high near 76. Northwest wind around 7 mph.
Saturday Night
Mostly clear, with a low around 58. West wind around 5 mph becoming light and variable in the evening.
Sunday
Sunny, with a high near 77. North wind around 6 mph.
Sunday Night
Mostly clear, with a low around 58.
Labor Day
Mostly sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 77.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 76.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
5:31 am EDT Aug 29, 2025
6am EDT Aug 29, 2025-6pm EDT Sep 4, 2025
 
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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