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

71°F

22°C

Humidity 76%
Wind Speed S 9 mph
Barometer 30.23 in (1023.8 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 6 Oct 5:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Clear, with a low around 60. South wind 6 to 10 mph.

    Low: 60 °F

    Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 74. Southwest wind 6 to 14 mph.

    High: 74 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 2am. Cloudy, with a low around 63. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers, mainly before 2pm. The rain could be heavy at times. High near 70. Southwest wind 10 to 14 mph becoming north in the afternoon. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    High: 70 °F

    Heavy Rain

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47. North wind around 14 mph, with gusts as high as 24 mph.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 60. South wind 6 to 10 mph.
Tuesday
Increasing clouds, with a high near 74. Southwest wind 6 to 14 mph.
Tuesday Night
Showers likely, mainly after 2am. Cloudy, with a low around 63. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Showers, mainly before 2pm. The rain could be heavy at times. High near 70. Southwest wind 10 to 14 mph becoming north in the afternoon. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Wednesday Night
Mostly clear, with a low around 47. North wind around 14 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 62.
Thursday Night
Clear, with a low around 46.
Friday
Sunny, with a high near 64.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Partly sunny, with a high near 66.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 53.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 65. Breezy.
Sunday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 54.
Columbus Day
A 30 percent chance of rain. Partly sunny, with a high near 68.
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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:
2:13 pm EDT Oct 6, 2025
Forecast Valid:
6pm EDT Oct 6, 2025-6pm EDT Oct 13, 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