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.

Partly Cloudy

78°F

26°C

Humidity 45%
Wind Speed SW 13 G 24 mph
Barometer 29.64 in (1003.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 19 Jun 3:56 pm EDT
Extended Forecast for

Setauket-East Setauket NY

  • Tonight

    Tonight: Mostly clear, with a low around 65. West wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 84. West wind around 17 mph, with gusts as high as 29 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Northwest wind 5 to 9 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 85. West wind 6 to 8 mph.

    High: 85 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 66. Southwest wind around 6 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 78 °F

    Showers

  • Monday Night

    Monday Night: Showers, mainly before 2am. Low around 67. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 84.

    High: 84 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 65. West wind 10 to 14 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 84. West wind around 17 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 63. Northwest wind 5 to 9 mph.
Sunday
Increasing clouds, with a high near 85. West wind 6 to 8 mph.
Sunday Night
Mostly cloudy, with a low around 66. Southwest wind around 6 mph becoming calm in the evening.
Monday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Showers, mainly before 2am. Low around 67. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 68.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Setauket-East Setauket NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
4:47 pm EDT Jun 19, 2026
Forecast Valid:
4pm EDT Jun 19, 2026-6pm EDT Jun 26, 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