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

64°F

18°C

Humidity 75%
Wind Speed S 8 mph
Barometer 30.08 in (1018.4 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 4 Nov 4:56 pm EST
Extended Forecast for

Islandia NY

  • Tonight

    Tonight: Increasing clouds, with a low around 58. Southwest wind 5 to 7 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 69. South wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 69 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a steady temperature around 63. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Rain Likely

  • Friday

    Friday: Rain and possibly a thunderstorm. High near 68. Southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 68 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Calm wind.

    Low: 53 °F

    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 58. Southwest wind 5 to 7 mph.
Thursday
A slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 69. South wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a steady temperature around 63. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain and possibly a thunderstorm. High near 68. Southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Calm wind.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 43.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 40.
Veterans Day
Sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islandia NY
 40.81°N 73.17°W (Elev. 161 ft)
Last Update:
1:23 pm EST Nov 4, 2026
Forecast Valid:
5pm EST Nov 4, 2026-6pm EST Nov 11, 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