National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

87°F

31°C

Humidity 65%
Wind Speed Calm
Barometer 30.11 in (1019.4 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 7 Aug 10:56 am EDT
Extended Forecast for

East Islip NY

Heat Advisory August 7, 11:53am until August 8, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 7, 11:53am until August 8, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Today

    High: 87 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms. Patchy fog after 2am. Otherwise, increasing clouds, with a low around 75. Southwest wind 5 to 7 mph. Chance of precipitation is 50%.

    Low: 75 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Heat index values as high as 96. Southwest wind 6 to 13 mph.

    High: 86 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 75. Southwest wind 7 to 9 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 88. West wind 7 to 10 mph.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 87. Heat index values as high as 98. Southwest wind 7 to 10 mph.
Tonight
A chance of showers and thunderstorms. Patchy fog after 2am. Otherwise, increasing clouds, with a low around 75. Southwest wind 5 to 7 mph. Chance of precipitation is 50%.
Saturday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Heat index values as high as 96. Southwest wind 6 to 13 mph.
Saturday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 75. Southwest wind 7 to 9 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 88. West wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 73.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 71.
Thursday
Mostly 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:
2:51 am EDT Aug 7, 2026
Forecast Valid:
11am EDT Aug 7, 2026-6pm EDT Aug 13, 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