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

39°F

4°C

Humidity 67%
Wind Speed Calm
Barometer 30.28 in (1025.2 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 24 Nov 6:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 36. Light and variable wind.

    Low: 36 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of rain after 1pm. Cloudy, with a high near 58. South wind 6 to 14 mph.

    High: 58 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 50. South wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: Showers likely, mainly before noon. Cloudy, with a high near 62. Southwest wind 9 to 13 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 62 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 38. West wind 10 to 15 mph.

    Low: 38 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 48. Breezy.

    High: 48 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 45. Breezy.

    High: 45 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 36. Light and variable wind.
Tuesday
A 50 percent chance of rain after 1pm. Cloudy, with a high near 58. South wind 6 to 14 mph.
Tuesday Night
Rain. Low around 50. South wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Showers likely, mainly before noon. Cloudy, with a high near 62. Southwest wind 9 to 13 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 38. West wind 10 to 15 mph.
Thanksgiving Day
Mostly sunny, with a high near 48. Breezy.
Thursday Night
Mostly clear, with a low around 32.
Friday
Mostly sunny, with a high near 45. Breezy.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 44.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 51.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 40.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
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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:
3:30 pm EST Nov 24, 2025
Forecast Valid:
7pm EST Nov 24, 2025-6pm EST Dec 1, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation