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.

Overcast

40°F

4°C

Humidity 68%
Wind Speed SW 17 G 29 mph
Barometer 29.93 in (1013.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 9 Dec 10:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 36. Southwest wind around 10 mph, with gusts as high as 23 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely after 1pm. Mostly cloudy, with a high near 49. Breezy, with a southwest wind 11 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Partly Sunny
    then Rain
    Likely and
    Breezy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 11 to 14 mph, with gusts as high as 30 mph.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a steady temperature around 33. Wind chill values between 20 and 25. West wind 15 to 17 mph, with gusts as high as 34 mph.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 23. West wind 11 to 16 mph, with gusts as high as 34 mph.

    Low: 23 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of light snow after 1am. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Light Snow

  • Saturday

    Saturday: Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly cloudy, with a steady temperature around 36. Southwest wind around 10 mph, with gusts as high as 23 mph.
Wednesday
Rain likely after 1pm. Mostly cloudy, with a high near 49. Breezy, with a southwest wind 11 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 11 to 14 mph, with gusts as high as 30 mph.
Thursday
Mostly sunny, with a steady temperature around 33. Wind chill values between 20 and 25. West wind 15 to 17 mph, with gusts as high as 34 mph.
Thursday Night
Partly cloudy, with a low around 23. West wind 11 to 16 mph, with gusts as high as 34 mph.
Friday
Mostly sunny, with a high near 39.
Friday Night
A 30 percent chance of light snow after 1am. Mostly cloudy, with a low around 27.
Saturday
Mostly cloudy, with a high near 44.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 30.
Sunday
A chance of snow before 9am, then a chance of rain between 9am and 1pm. Partly sunny, with a high near 41. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Mostly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 21.
Tuesday
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:
5:42 pm EST Dec 9, 2025
Forecast Valid:
11pm EST Dec 9, 2025-6pm EST Dec 16, 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