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.

Mostly Cloudy

59°F

15°C

Humidity 81%
Wind Speed S 9 mph
Barometer 29.77 in (1007.9 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 16 Apr 8:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Mostly cloudy, with a steady temperature around 57. West wind 5 to 8 mph.

    Low: 57 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers after 2pm. Partly sunny, with a high near 74. West wind 5 to 7 mph. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51. East wind 3 to 5 mph.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 60. East wind 6 to 8 mph.

    High: 60 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Cloudy, with a low around 47. Southeast wind 3 to 5 mph.

    Low: 47 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 57 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 38. Chance of precipitation is 80%.

    Low: 38 °F

    Showers then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers after 2am. Mostly cloudy, with a steady temperature around 57. West wind 5 to 8 mph.
Friday
A slight chance of showers before 11am, then a chance of showers after 2pm. Partly sunny, with a high near 74. West wind 5 to 7 mph. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51. East wind 3 to 5 mph.
Saturday
Partly sunny, with a high near 60. East wind 6 to 8 mph.
Saturday Night
A 30 percent chance of showers after 2am. Cloudy, with a low around 47. Southeast wind 3 to 5 mph.
Sunday
Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers, mainly before 8pm. Low around 38. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
Partly sunny, with a high near 62.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 60.
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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:
7:20 pm EDT Apr 16, 2026
Forecast Valid:
9pm EDT Apr 16, 2026-6pm EDT Apr 23, 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