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.

Partly Cloudy

43°F

6°C

Humidity 49%
Wind Speed E 3 mph
Barometer 30.09 in (1019.0 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 7 Dec 10:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Partly sunny, with a high near 42. Northwest wind 5 to 7 mph becoming southwest in the afternoon.

    High: 42 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 6 to 14 mph, with gusts as high as 28 mph.

    Low: 25 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31. Wind chill values between 15 and 20. North wind 11 to 16 mph, with gusts as high as 30 mph.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16. North wind 5 to 9 mph becoming light after midnight.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    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. Mostly cloudy, with a high near 49.

    High: 49 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 42. Northwest wind 5 to 7 mph becoming southwest in the afternoon.
Tonight
Partly cloudy, with a low around 25. Wind chill values between 20 and 25. West wind 6 to 14 mph, with gusts as high as 28 mph.
Monday
Mostly sunny, with a high near 31. Wind chill values between 15 and 20. North wind 11 to 16 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 16. North wind 5 to 9 mph becoming light after midnight.
Tuesday
Increasing clouds, with a high near 41. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 49.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 35.
Thursday
Mostly sunny, with a high near 44.
Thursday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 41. Chance of precipitation is 40%.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
7:42 am EST Dec 7, 2025
Forecast Valid:
11am EST Dec 7, 2025-6pm EST Dec 13, 2025
 
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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