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

82°F

28°C

Humidity 32%
Wind Speed Vrbl 6 mph
Barometer 30.19 in (1022.1 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 4 Oct 12:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Southwest wind around 6 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60. Southwest wind 3 to 5 mph.

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 77. Light southwest wind increasing to 5 to 9 mph in the morning.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.

    Low: 59 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.

    High: 71 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Southwest wind around 6 mph.
Tonight
Mostly clear, with a low around 59. Light and variable wind.
Sunday
Sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 60. Southwest wind 3 to 5 mph.
Monday
Sunny, with a high near 77. Light southwest wind increasing to 5 to 9 mph in the morning.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.
Wednesday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.
Wednesday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 48.
Thursday
Sunny, with a high near 62.
Thursday Night
Mostly clear, with a low around 48.
Friday
Mostly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
10:06 am EDT Oct 4, 2025
Forecast Valid:
1pm EDT Oct 4, 2025-6pm EDT Oct 10, 2025
 
Forecast Discussion
 
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Additional Resources

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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