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.

A Few Clouds

73°F

23°C

Humidity 71%
Wind Speed S 14 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 18 May 5:56 pm EDT
Extended Forecast for

Setauket-East Setauket NY

  • Tonight

    Tonight: Mostly clear, with a low around 66. Southwest wind 8 to 13 mph.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. Southwest wind 8 to 14 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 69. Southwest wind 9 to 11 mph.

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms between 2pm and 5pm, then showers and possibly a thunderstorm after 5pm. High near 89. Southwest wind 8 to 13 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Mostly Sunny
    then Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 11pm, then a chance of showers between 11pm and 2am. Low around 57. North wind 7 to 11 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Showers then
    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

  • Friday Night

    Friday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 66. Southwest wind 8 to 13 mph.
Tuesday
Sunny, with a high near 89. Southwest wind 8 to 14 mph.
Tuesday Night
Partly cloudy, with a low around 69. Southwest wind 9 to 11 mph.
Wednesday
A chance of showers and thunderstorms between 2pm and 5pm, then showers and possibly a thunderstorm after 5pm. High near 89. Southwest wind 8 to 13 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 11pm, then a chance of showers between 11pm and 2am. Low around 57. North wind 7 to 11 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Partly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 54.
Friday
Partly sunny, with a high near 69.
Friday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Saturday
Showers likely. Cloudy, with a high near 65. Chance of precipitation is 70%.
Saturday Night
Showers likely. Cloudy, with a low around 54. Chance of precipitation is 70%.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 68.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 56.
Memorial Day
A 30 percent chance of showers. Mostly cloudy, with a high near 72.
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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:
3:16 pm EDT May 18, 2026
Forecast Valid:
6pm EDT May 18, 2026-6pm EDT May 25, 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