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.

Overcast

48°F

9°C

Humidity 83%
Wind Speed S 12 mph
Barometer 30.15 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 9 Jan 2:56 pm EST
Extended Forecast for

East Setauket NY

  • This Afternoon

    This Afternoon: Isolated showers after 4pm. Cloudy, with a high near 49. South wind around 11 mph. Chance of precipitation is 20%.

    High: 49 °F

    Isolated
    Showers

  • Tonight

    Tonight: Showers likely, mainly before 9pm. Mostly cloudy, with a low around 38. South wind 6 to 11 mph becoming northwest after midnight. Chance of precipitation is 60%.

    Low: 38 °F

    Showers
    Likely then
    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after 1pm. High near 43. Light and variable wind becoming northeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 43 °F

    Partly Sunny
    then Rain

  • Saturday Night

    Saturday Night: Rain. Steady temperature around 40. East wind 6 to 9 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain, mainly before 1pm. Partly sunny, with a high near 44. West wind 8 to 18 mph.

    High: 44 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. Breezy.

    Low: 28 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

Detailed Forecast

This Afternoon
Isolated showers after 4pm. Cloudy, with a high near 49. South wind around 11 mph. Chance of precipitation is 20%.
Tonight
Showers likely, mainly before 9pm. Mostly cloudy, with a low around 38. South wind 6 to 11 mph becoming northwest after midnight. Chance of precipitation is 60%.
Saturday
Rain, mainly after 1pm. High near 43. Light and variable wind becoming northeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain. Steady temperature around 40. East wind 6 to 9 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain, mainly before 1pm. Partly sunny, with a high near 44. West wind 8 to 18 mph.
Sunday Night
Partly cloudy, with a low around 28. Breezy.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 39.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 32.
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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:
1:01 pm EST Jan 9, 2026
Forecast Valid:
3pm EST Jan 9, 2026-6pm EST Jan 16, 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