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.

Mostly Cloudy

55°F

13°C

Humidity 87%
Wind Speed S 15 G 29 mph
Barometer 29.78 in (1008.4 mb)
Dewpoint 51°F (11°C)
Visibility 9.00 mi
Wind Chill51°F (11°C)
Last update 11 Mar 5:56 pm EDT
Extended Forecast for

East Setauket NY

  • Tonight

    Tonight: A slight chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 40. Southwest wind around 14 mph. Chance of precipitation is 50%.

    Low: 40 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers, mainly before 5pm. High near 53. Northwest wind 13 to 16 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31. West wind 9 to 13 mph.

    Low: 31 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 45. West wind 5 to 15 mph becoming south in the afternoon.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 13 to 16 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 47.

    High: 47 °F

    Cloudy

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Low around 39. Chance of precipitation is 80%.

    Low: 39 °F

    Chance
    Showers then
    Showers

Detailed Forecast

Tonight
A slight chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 40. Southwest wind around 14 mph. Chance of precipitation is 50%.
Thursday
Showers, mainly before 5pm. High near 53. Northwest wind 13 to 16 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31. West wind 9 to 13 mph.
Friday
Increasing clouds, with a high near 45. West wind 5 to 15 mph becoming south in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 13 to 16 mph.
Saturday
Sunny, with a high near 48.
Saturday Night
Increasing clouds, with a low around 32.
Sunday
Cloudy, with a high near 47.
Sunday Night
Showers, mainly after 2am. Low around 39. Chance of precipitation is 80%.
Monday
Showers. High near 55. Breezy. Chance of precipitation is 90%.
Monday Night
Showers likely. Mostly cloudy, with a low around 30. Chance of precipitation is 60%.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 38.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Mostly sunny, with a high near 36.
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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:
3:16 pm EDT Mar 11, 2026
Forecast Valid:
6pm EDT Mar 11, 2026-6pm EDT Mar 18, 2026
 
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Additional Resources

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Chance of Precipitation