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.

Mostly Cloudy

73°F

23°C

Humidity 59%
Wind Speed NW 12 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 May 8:56 am EDT
Extended Forecast for

East Setauket NY

  • Today

    Today: Sunny, with a high near 88. Southwest wind 6 to 11 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Southwest wind 5 to 9 mph becoming calm in the evening.

    Low: 63 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 82. East wind 6 to 8 mph.

    High: 82 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. South wind around 6 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85. Southwest wind 7 to 14 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely after 2pm. Sunny, then becoming mostly cloudy during the afternoon, with a high near 87. Chance of precipitation is 70%.

    High: 87 °F

    Sunny then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Thursday

    Thursday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 88. Southwest wind 6 to 11 mph.
Tonight
Partly cloudy, with a low around 63. Southwest wind 5 to 9 mph becoming calm in the evening.
Monday
Partly sunny, then gradually becoming sunny, with a high near 82. East wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 64. South wind around 6 mph.
Tuesday
Sunny, with a high near 85. Southwest wind 7 to 14 mph.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Showers likely after 2pm. Sunny, then becoming mostly cloudy during the afternoon, with a high near 87. Chance of precipitation is 70%.
Wednesday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Thursday
Partly sunny, with a high near 75.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 70.
Friday Night
Mostly cloudy, with a low around 53.
Saturday
A 40 percent chance of showers. Mostly cloudy, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NY
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
5:34 am EDT May 17, 2026
Forecast Valid:
9am EDT May 17, 2026-6pm EDT May 23, 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