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.

Light Drizzle Fog/Mist

65°F

18°C

Humidity 97%
Wind Speed E 7 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 64°F (18°C)
Visibility 0.50 mi
Last update 17 Jun 10:56 am EDT
Extended Forecast for

Setauket-East Setauket NY

  • Today

    Today: A 30 percent chance of showers, mainly before 2pm. Cloudy, with a high near 73. Southeast wind around 7 mph.

    High: 73 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers, with thunderstorms also possible after 5am. Patchy fog. Otherwise, cloudy, with a low around 64. Southeast wind 3 to 5 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 2pm, then a chance of showers between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 81. South wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. South wind around 6 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Juneteenth

    Juneteenth: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers between 8pm and 11pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers then
    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Friday Night

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

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers, mainly before 2pm. Cloudy, with a high near 73. Southeast wind around 7 mph.
Tonight
A chance of showers, with thunderstorms also possible after 5am. Patchy fog. Otherwise, cloudy, with a low around 64. Southeast wind 3 to 5 mph. Chance of precipitation is 30%.
Wednesday
A slight chance of showers and thunderstorms before 2pm, then a chance of showers between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 81. South wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. South wind around 6 mph. Chance of precipitation is 60%.
Juneteenth
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers between 8pm and 11pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
Sunny, with a high near 86.
Friday Night
Mostly clear, with a low around 66.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Mostly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
9:49 am EDT Jun 17, 2025
Forecast Valid:
11am EDT Jun 17, 2025-6pm EDT Jun 23, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation