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

83°F

28°C

Humidity 48%
Wind Speed N 6 mph
Barometer 30.11 in (1019.4 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 4 Aug 12:56 pm EDT
Extended Forecast for

East Setauket NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 83. Light east wind.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. Southeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.

    High: 83 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 72. South wind around 6 mph.

    Low: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 88. Southwest wind 5 to 10 mph.

    High: 88 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 83. Light east wind.
Tonight
Mostly cloudy, with a low around 66. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 72. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 88. Southwest wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 74.
Friday
Mostly sunny, with a high near 90.
Friday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 88.
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:
6:53 am EDT Aug 4, 2026
Forecast Valid:
1pm EDT Aug 4, 2026-6pm EDT Aug 10, 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