Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

76°F

24°C

Humidity 85%
Wind Speed S 8 mph
Barometer 29.87 in (1011.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 18 Aug 6:56 pm EDT
Extended Forecast for

Setauket-East Setauket NY

  • Tonight

    Tonight: Increasing clouds, with a low around 68. South wind around 5 mph becoming calm  in the evening.

    Low: 68 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon.

    High: 85 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70. South wind 3 to 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 83. Northwest wind 3 to 5 mph.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am.  Mostly cloudy, with a low around 65. Calm wind becoming north around 5 mph after midnight.  Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after 2am.  Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers.  Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly after 2am.  Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
Increasing clouds, with a low around 68. South wind around 5 mph becoming calm in the evening.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 70. South wind 3 to 6 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83. Northwest wind 3 to 5 mph.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 81.
Friday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 65.
Saturday
A 50 percent chance of showers. Partly sunny, with a high near 78.
Saturday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Sunday
Showers likely, mainly before 8am. Partly sunny, with a high near 81. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Monday
Sunny, with a high near 81.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Sunny, with a high near 81.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.92°N 73.12°W (Elev. 112 ft)
2:34 pm EDT Aug 18, 2026
7pm EDT Aug 18, 2026-6pm EDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database