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

45°F

7°C

Humidity 58%
Wind Speed SW 7 mph
Barometer 29.85 in (1010.9 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 6 Dec 2:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 29. Northwest wind 6 to 9 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 44. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 44 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 6 to 13 mph.

    Low: 25 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33. Wind chill values between 15 and 20. North wind 15 to 18 mph, with gusts as high as 28 mph.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18. North wind 5 to 11 mph.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41.

    High: 41 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 29. Northwest wind 6 to 9 mph.
Sunday
Partly sunny, with a high near 44. Light and variable wind becoming south 5 to 8 mph in the morning.
Sunday Night
Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 6 to 13 mph.
Monday
Mostly sunny, with a high near 33. Wind chill values between 15 and 20. North wind 15 to 18 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 18. North wind 5 to 11 mph.
Tuesday
Increasing clouds, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 49.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 44.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 29.
Friday
A chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of snow. Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 36.
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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:
12:55 pm EST Dec 6, 2025
Forecast Valid:
3pm EST Dec 6, 2025-6pm EST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation