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.

Mostly Cloudy

64°F

18°C

Humidity 75%
Wind Speed Calm
Barometer 30.21 in (1023.1 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 31 Aug 10:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 60. Light northeast wind.

    Low: 60 °F

    Mostly Cloudy

  • Labor Day

    Labor Day: Mostly sunny, with a high near 77. Northeast wind 11 to 16 mph.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57. Northeast wind 6 to 9 mph.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Northeast wind 8 to 10 mph.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. South wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 60. Light northeast wind.
Labor Day
Mostly sunny, with a high near 77. Northeast wind 11 to 16 mph.
Monday Night
Mostly clear, with a low around 57. Northeast wind 6 to 9 mph.
Tuesday
Sunny, with a high near 78. Northeast wind 8 to 10 mph.
Tuesday Night
Mostly clear, with a low around 59. South wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 65.
Friday
Showers likely, mainly before 2pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
Mostly sunny, with a high near 77.
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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:
11:19 pm EDT Aug 31, 2025
Forecast Valid:
11pm EDT Aug 31, 2025-6pm EDT Sep 7, 2025
 
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