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

57°F

14°C

Humidity 36%
Wind Speed NE 10 mph
Barometer 30.54 in (1034.2 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 18 Oct 3:56 pm EDT
Extended Forecast for

Islandia NY

  • Tonight

    Tonight: Clear, with a low around 41. Light northeast wind.

    Low: 41 °F

    Clear

  • Monday

    Monday: Increasing clouds, with a high near 61. Northeast wind 7 to 11 mph.

    High: 61 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 45. North wind 8 to 11 mph, with gusts as high as 24 mph.

    Low: 45 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 64. North wind around 15 mph, with gusts as high as 26 mph.

    High: 64 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45. Northeast wind 11 to 15 mph, with gusts as high as 28 mph.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 41. Light northeast wind.
Monday
Increasing clouds, with a high near 61. Northeast wind 7 to 11 mph.
Monday Night
Mostly cloudy, with a low around 45. North wind 8 to 11 mph, with gusts as high as 24 mph.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 64. North wind around 15 mph, with gusts as high as 26 mph.
Tuesday Night
Partly cloudy, with a low around 45. Northeast wind 11 to 15 mph, with gusts as high as 28 mph.
Wednesday
Mostly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 58.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 57.
Saturday Night
Mostly clear, with a low around 42.
Sunday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islandia NY
 40.81°N 73.17°W (Elev. 161 ft)
Last Update:
2:41 pm EDT Oct 18, 2026
Forecast Valid:
4pm EDT Oct 18, 2026-6pm EDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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