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.

Partly Cloudy

76°F

24°C

Humidity 85%
Wind Speed S 8 mph
Barometer 29.87 in (1011.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 18 Aug 6:56 pm EDT
Extended Forecast for

East Islip NY

  • Tonight

    Tonight: Increasing clouds, with a low around 71. Southwest wind 3 to 7 mph.

    Low: 71 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 82. Light west wind becoming southwest 5 to 9 mph in the afternoon.

    High: 82 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 72. Southwest wind 6 to 9 mph.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 81. Northwest wind 5 to 7 mph becoming southwest in the afternoon.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 68. Light and variable wind becoming north around 6 mph after midnight. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly between 8am and 2pm. Partly sunny, with a high near 77. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 71. Southwest wind 3 to 7 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 82. Light west wind becoming southwest 5 to 9 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 72. Southwest wind 6 to 9 mph.
Thursday
A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 81. Northwest wind 5 to 7 mph becoming southwest in the afternoon.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 68. Light and variable wind becoming north around 6 mph after midnight. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 79.
Friday Night
A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 67.
Saturday
Showers likely, mainly between 8am and 2pm. Partly sunny, with a high near 77. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 79.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Islip NY
 40.7°N 73.19°W (Elev. 0 ft)
Last Update:
2:34 pm EDT Aug 18, 2026
Forecast Valid:
7pm EDT Aug 18, 2026-6pm EDT Aug 25, 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