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

40°F

4°C

Humidity 70%
Wind Speed W 8 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 14 Nov 4:56 am EST
Extended Forecast for

East Setauket NY

  • Today

    Today: Mostly sunny, with a high near 49. Northwest wind 13 to 16 mph.

    High: 49 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 36. North wind 9 to 11 mph.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, increasing clouds, with a high near 53. Northwest wind around 7 mph becoming southwest in the afternoon.

    High: 53 °F

    Patchy Frost
    then
    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Rain. Temperature rising to around 52 by 3am. South wind 7 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F⇑

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 54 by 8am, then falling to around 48 during the remainder of the day. Breezy, with a west wind 14 to 20 mph, with gusts as high as 32 mph.

    High: 54 °F⇓

    Chance Rain
    and Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 47.

    High: 47 °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

Detailed Forecast

Today
Mostly sunny, with a high near 49. Northwest wind 13 to 16 mph.
Tonight
Partly cloudy, with a low around 36. North wind 9 to 11 mph.
Saturday
Patchy frost before 8am. Otherwise, increasing clouds, with a high near 53. Northwest wind around 7 mph becoming southwest in the afternoon.
Saturday Night
Rain. Temperature rising to around 52 by 3am. South wind 7 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 54 by 8am, then falling to around 48 during the remainder of the day. Breezy, with a west wind 14 to 20 mph, with gusts as high as 32 mph.
Sunday Night
Partly cloudy, with a low around 37.
Monday
Mostly sunny, with a high near 47.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Partly cloudy, with a low around 35.
Thursday
Mostly sunny, with a high near 49.
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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:
1:06 am EST Nov 14, 2025
Forecast Valid:
5am EST Nov 14, 2025-6pm EST Nov 20, 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