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.

Mostly Cloudy

78°F

26°C

Humidity 71%
Wind Speed S 15 mph
Barometer 30.06 in (1017.8 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 10:56 am EDT
Extended Forecast for

Setauket-East Setauket NY

  • Today

    Today: A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 80. South wind 11 to 14 mph. Chance of precipitation is 20%.

    High: 80 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 8pm. Increasing clouds, with a low around 68. South wind 5 to 9 mph becoming light after midnight.

    Low: 68 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79. North wind 3 to 6 mph.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 80. South wind 11 to 14 mph. Chance of precipitation is 20%.
Tonight
A 20 percent chance of showers and thunderstorms after 8pm. Increasing clouds, with a low around 68. South wind 5 to 9 mph becoming light after midnight.
Friday
A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 66. Light and variable wind.
Saturday
Mostly sunny, with a high near 79. North wind 3 to 6 mph.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Partly sunny, with a high near 81.
Monday Night
Mostly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 80.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.91°N 73.09°W (Elev. 197 ft)
Last Update:
8:44 am EDT Aug 27, 2026
Forecast Valid:
11am EDT Aug 27, 2026-6pm EDT Sep 2, 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