National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

55°F

13°C

Humidity 77%
Wind Speed SE 5 mph
Barometer 30.18 in (1021.8 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 15 Oct 8:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Showers likely after 5am. Increasing clouds, with a temperature falling to near 52 by midnight, then rising to around 57 during the remainder of the night. Southeast wind 6 to 9 mph. Chance of precipitation is 60%.

    Low: 52 °F⇑

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers before 2pm, then a chance of showers and thunderstorms after 5pm. High near 72. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers after 8pm. Low around 45. Southwest wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 55. North wind around 17 mph, with gusts as high as 28 mph.

    High: 55 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40. North wind 10 to 13 mph.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely after 5am. Increasing clouds, with a temperature falling to near 52 by midnight, then rising to around 57 during the remainder of the night. Southeast wind 6 to 9 mph. Chance of precipitation is 60%.
Friday
Showers before 2pm, then a chance of showers and thunderstorms after 5pm. High near 72. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms, then showers after 8pm. Low around 45. Southwest wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 55. North wind around 17 mph, with gusts as high as 28 mph.
Saturday Night
Mostly clear, with a low around 40. North wind 10 to 13 mph.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 43.
Monday
Sunny, with a high near 61.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Mostly sunny, with a high near 61.
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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:
2:36 pm EDT Oct 15, 2026
Forecast Valid:
9pm EDT Oct 15, 2026-6pm EDT Oct 22, 2026
 
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