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

80°F

27°C

Humidity 51%
Wind Speed SW 13 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 25 Jun 3:56 pm EDT
Extended Forecast for

Setauket-East Setauket NY

  • Tonight

    Tonight: A chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 66. South wind 7 to 10 mph. Chance of precipitation is 50%.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 11am, then a slight chance of showers after 5pm. Partly sunny, with a high near 83. Southwest wind around 8 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Partly Sunny

  • Friday Night

    Friday Night: A slight chance of showers before 8pm, then showers likely after 2am. Mostly cloudy, with a low around 67. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 67 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers. High near 74. Calm wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 74 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 65. Light north wind. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Monday Night

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

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 66. South wind 7 to 10 mph. Chance of precipitation is 50%.
Friday
A chance of showers and thunderstorms before 11am, then a slight chance of showers after 5pm. Partly sunny, with a high near 83. Southwest wind around 8 mph. Chance of precipitation is 30%.
Friday Night
A slight chance of showers before 8pm, then showers likely after 2am. Mostly cloudy, with a low around 67. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Showers. High near 74. Calm wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 65. Light north wind. Chance of precipitation is 60%.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 89.
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ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.91°N 73.09°W (Elev. 197 ft)
Last Update:
2:19 pm EDT Jun 25, 2026
Forecast Valid:
4pm EDT Jun 25, 2026-6pm EDT Jul 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