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.

Light Rain

80°F

27°C

Humidity 79%
Wind Speed SW 13 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 17 Jul 8:56 am EDT
Extended Forecast for

East Setauket NY

Heat Advisory July 17, 09:49am until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 17, 09:49am until July 17, 10:00pm

    NOW until 10:00pm Thu

    Heat Advisory

  • Today

    High: 92 °F

    Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 72. West wind 11 to 15 mph.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 84. Northwest wind 7 to 11 mph.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68. North wind around 6 mph.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 85. Northeast wind 5 to 7 mph becoming south in the afternoon.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, mainly after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 86. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly before 11am. Mostly sunny, with a high near 92. Heat index values as high as 101. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 72. West wind 11 to 15 mph.
Friday
Mostly sunny, with a high near 84. Northwest wind 7 to 11 mph.
Friday Night
Mostly clear, with a low around 68. North wind around 6 mph.
Saturday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 85. Northeast wind 5 to 7 mph becoming south in the afternoon.
Saturday Night
Showers likely and possibly a thunderstorm, mainly after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Sunday Night
Partly cloudy, with a low around 68.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
6:08 am EDT Jul 17, 2025
Forecast Valid:
9am EDT Jul 17, 2025-6pm EDT Jul 23, 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