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

39°F

4°C

Humidity 65%
Wind Speed SW 12 G 23 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 9 Dec 9:56 pm EST
Extended Forecast for

Islip NYSimilar City Names

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 35. Southwest wind 11 to 13 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely after 1pm. Mostly cloudy, with a high near 48. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 39 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Breezy.
    Partly Sunny
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. Southwest wind 13 to 17 mph, with gusts as high as 32 mph.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a steady temperature around 34. Wind chill values between 20 and 25. West wind 16 to 18 mph, with gusts as high as 34 mph.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. West wind 13 to 18 mph, with gusts as high as 36 mph.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °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 42.

    High: 42 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly cloudy, with a steady temperature around 35. Southwest wind 11 to 13 mph, with gusts as high as 25 mph.
Wednesday
Rain likely after 1pm. Mostly cloudy, with a high near 48. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 39 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. Southwest wind 13 to 17 mph, with gusts as high as 32 mph.
Thursday
Mostly sunny, with a steady temperature around 34. Wind chill values between 20 and 25. West wind 16 to 18 mph, with gusts as high as 34 mph.
Thursday Night
Partly cloudy, with a low around 25. West wind 13 to 18 mph, with gusts as high as 36 mph.
Friday
Mostly sunny, with a high near 37.
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 42.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 29.
Sunday
A chance of snow before 9am, then a chance of rain between 9am and 1pm. Partly sunny, with a high near 39. 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 22.
Tuesday
Mostly sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
5:42 pm EST Dec 9, 2025
Forecast Valid:
10pm 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