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.

Fair

36°F

2°C

Humidity 67%
Wind Speed W 3 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 15 Nov 4:56 am EST
Extended Forecast for

East Setauket NY

  • Today

    Today: A 20 percent chance of showers after 4pm. Increasing clouds, with a high near 55. North wind around 6 mph becoming south in the afternoon.

    High: 55 °F

    Sunny then
    Slight Chance
    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm, mainly before 4am. Temperature rising to around 53 by 2am. South wind 8 to 13 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 46 °F⇑

    Showers

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a temperature falling to around 46 by 5pm. Breezy, with a west wind 14 to 20 mph, with gusts as high as 36 mph.

    High: 57 °F⇓

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. Breezy, with a west wind 18 to 21 mph, with gusts as high as 34 mph.

    Low: 35 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 46. West wind around 18 mph, with gusts as high as 30 mph.

    High: 46 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers after 4pm. Increasing clouds, with a high near 55. North wind around 6 mph becoming south in the afternoon.
Tonight
Showers and possibly a thunderstorm, mainly before 4am. Temperature rising to around 53 by 2am. South wind 8 to 13 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Cloudy through mid morning, then gradual clearing, with a temperature falling to around 46 by 5pm. Breezy, with a west wind 14 to 20 mph, with gusts as high as 36 mph.
Sunday Night
Partly cloudy, with a low around 35. Breezy, with a west wind 18 to 21 mph, with gusts as high as 34 mph.
Monday
Mostly sunny, with a high near 46. West wind around 18 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Partly cloudy, with a low around 37.
Thursday
Partly sunny, with a high near 50.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 42.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 56.
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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:
5:10 am EST Nov 15, 2025
Forecast Valid:
5am EST Nov 15, 2025-6pm EST Nov 21, 2025
 
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