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

48°F

9°C

Humidity 48%
Wind Speed W 7 mph
Barometer 30.23 in (1023.8 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 24 Nov 4:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Increasing clouds, with a low around 37. North wind around 5 mph becoming calm in the evening.

    Low: 37 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 50 percent chance of rain after 1pm. Cloudy, with a high near 57. Southwest wind 6 to 10 mph.

    High: 57 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 50. South wind 8 to 10 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 60. Southwest wind 7 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 37. West wind 8 to 13 mph, with gusts as high as 24 mph.

    Low: 37 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 44. Breezy.

    High: 44 °F

    Mostly Sunny
    and Breezy

  • Friday Night

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

    Low: 31 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 37. North wind around 5 mph becoming calm in the evening.
Tuesday
A 50 percent chance of rain after 1pm. Cloudy, with a high near 57. Southwest wind 6 to 10 mph.
Tuesday Night
Rain. Low around 50. South wind 8 to 10 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 60. Southwest wind 7 to 10 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 37. West wind 8 to 13 mph, with gusts as high as 24 mph.
Thanksgiving Day
Mostly sunny, with a high near 46.
Thursday Night
Mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 44. Breezy.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 43.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 50.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 39.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
3:30 pm EST Nov 24, 2025
Forecast Valid:
5pm 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