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.

Fair

72°F

22°C

Humidity 76%
Wind Speed Calm
Barometer 30.01 in (1016.0 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 10 Aug 3:56 am EDT
Extended Forecast for

East Setauket NY

Heat Advisory August 10, 04:38am until August 10, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 10, 04:38am until August 10, 07:00pm

    NOW until 7:00pm Mon

    Heat Advisory

  • Today

    High: 90 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 74. Southwest wind 6 to 8 mph.

    Low: 74 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. West wind around 9 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. North wind 5 to 7 mph.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. North wind around 5 mph becoming northwest in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 2am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 88.

    High: 88 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 90. Heat index values as high as 96. Calm wind becoming south 5 to 7 mph in the afternoon.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 74. Southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 89. West wind around 9 mph.
Tuesday Night
Partly cloudy, with a low around 70. North wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 86. North wind around 5 mph becoming northwest in the afternoon.
Wednesday Night
A 40 percent chance of showers after 2am. Partly cloudy, with a low around 71.
Thursday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 70.
Friday
Sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 66.
Sunday
Mostly sunny, with a high near 81.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
3:02 am EDT Aug 10, 2026
Forecast Valid:
4am EDT Aug 10, 2026-6pm EDT Aug 16, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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