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.

A Few Clouds

72°F

22°C

Humidity 87%
Wind Speed S 6 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 27 Aug 12:56 am EDT
Extended Forecast for

East Setauket NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 69. South wind around 6 mph.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. South wind 7 to 13 mph.

    High: 81 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind 5 to 10 mph becoming light southwest after midnight. Chance of precipitation is 50%.

    Low: 69 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Partly sunny, with a high near 83. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 20%.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 65. Light and variable wind becoming north 5 to 7 mph after midnight.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Sunday Night

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

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 69. South wind around 6 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. South wind 7 to 13 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind 5 to 10 mph becoming light southwest after midnight. Chance of precipitation is 50%.
Friday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Partly sunny, with a high near 83. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 65. Light and variable wind becoming north 5 to 7 mph after midnight.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 70.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 70.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 82.
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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:
2:53 pm EDT Aug 26, 2026
Forecast Valid:
1am 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