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.

Light Rain

76°F

24°C

Humidity 91%
Wind Speed NE 10 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Heat Index76°F (24°C)
Last update 26 Jun 6:56 am EDT
Extended Forecast for

Islip NY

  • Today

    Today: Showers likely and possibly a thunderstorm before 11am, then a chance of showers. Partly sunny, with a steady temperature around 75. East wind 9 to 14 mph. Chance of precipitation is 60%.

    High: 75 °F

    Showers
    Likely

  • Tonight

    Tonight: A 20 percent chance of showers. Mostly cloudy, with a low around 63. East wind 8 to 10 mph.

    Low: 63 °F

    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers. Mostly cloudy, with a high near 70. East wind 10 to 14 mph.

    High: 70 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 63. East wind 6 to 9 mph.

    Low: 63 °F

    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 78. South wind 5 to 9 mph. Chance of precipitation is 40%.

    High: 78 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before 11am, then a chance of showers. Partly sunny, with a steady temperature around 75. East wind 9 to 14 mph. Chance of precipitation is 60%.
Tonight
A 20 percent chance of showers. Mostly cloudy, with a low around 63. East wind 8 to 10 mph.
Friday
A 20 percent chance of showers. Mostly cloudy, with a high near 70. East wind 10 to 14 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 63. East wind 6 to 9 mph.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 78. South wind 5 to 9 mph. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
Sunday
Partly sunny, with a high near 78.
Sunday Night
Mostly cloudy, with a low around 66.
Monday
Partly sunny, with a high near 80.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 85.
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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:
6:09 am EDT Jun 26, 2025
Forecast Valid:
7am EDT Jun 26, 2025-6pm EDT Jul 2, 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