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

38°F

3°C

Humidity 46%
Wind Speed W 13 G 23 mph
Barometer 29.57 in (1001.3 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 17 Nov 4:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Mostly sunny, with a high near 45. Wind chill values between 25 and 35 early. Northwest wind 15 to 17 mph, with gusts as high as 36 mph.

    High: 45 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 33. West wind 9 to 13 mph, with gusts as high as 29 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 47. West wind 9 to 11 mph, with gusts as high as 22 mph.

    High: 47 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 34. West wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 49. Calm wind becoming north 5 to 7 mph in the morning.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 51.

    High: 51 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Cloudy, with a low around 42.

    Low: 42 °F

    Cloudy

  • Friday

    Friday: A 50 percent chance of rain. Cloudy, with a high near 57.

    High: 57 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 45. Wind chill values between 25 and 35 early. Northwest wind 15 to 17 mph, with gusts as high as 36 mph.
Tonight
Mostly clear, with a low around 33. West wind 9 to 13 mph, with gusts as high as 29 mph.
Tuesday
Increasing clouds, with a high near 47. West wind 9 to 11 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 34. West wind around 5 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 49. Calm wind becoming north 5 to 7 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
Mostly cloudy, with a high near 51.
Thursday Night
Cloudy, with a low around 42.
Friday
A 50 percent chance of rain. Cloudy, with a high near 57.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Mostly sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.74°N 73.16°W (Elev. 7 ft)
Last Update:
5:32 am EST Nov 17, 2025
Forecast Valid:
5am EST Nov 17, 2025-6pm EST Nov 23, 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