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.

Partly Cloudy

81°F

27°C

Humidity 35%
Wind Speed NW 12 mph
Barometer 29.93 in (1013.3 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 24 Jun 4:56 pm EDT
Extended Forecast for

East Setauket NY

  • Tonight

    Tonight: Mostly clear, with a low around 64. West wind 6 to 11 mph becoming light in the evening.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers before 2am, then a chance of showers and thunderstorms between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. South wind 8 to 10 mph. Chance of precipitation is 60%.

    Low: 66 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 8am, then a slight chance of showers between 8am and 2pm. Partly sunny, with a high near 84. Southwest wind around 7 mph. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 68. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers then
    Mostly Cloudy

  • 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

Detailed Forecast

Tonight
Mostly clear, with a low around 64. West wind 6 to 11 mph becoming light in the evening.
Thursday
Mostly sunny, with a high near 80. Calm wind becoming south 5 to 9 mph in the afternoon.
Thursday Night
A slight chance of showers before 2am, then a chance of showers and thunderstorms between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. South wind 8 to 10 mph. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm before 8am, then a slight chance of showers between 8am and 2pm. Partly sunny, with a high near 84. Southwest wind around 7 mph. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 68. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
2:41 pm EDT Jun 24, 2026
Forecast Valid:
5pm EDT Jun 24, 2026-6pm EDT Jul 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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