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

77°F

25°C

Humidity 62%
Wind Speed S 13 G 18 mph
Barometer 30.08 in (1018.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 26 Aug 1:56 pm EDT
Extended Forecast for

East Islip NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 79. Southwest wind around 8 mph.

    High: 79 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 69. South wind around 7 mph.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 80. South wind 8 to 15 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 68. South wind 5 to 11 mph. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm, then a slight chance of showers after 2pm. Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 79. Southwest wind around 8 mph.
Tonight
Partly cloudy, with a low around 69. South wind around 7 mph.
Thursday
A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 80. South wind 8 to 15 mph. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 68. South wind 5 to 11 mph. Chance of precipitation is 50%.
Friday
A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm, then a slight chance of showers after 2pm. Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
Sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Islip NY
 40.73°N 73.19°W (Elev. 16 ft)
Last Update:
2:49 am EDT Aug 26, 2026
Forecast Valid:
2pm EDT Aug 26, 2026-6pm EDT Sep 1, 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