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

36°F

2°C

Humidity 82%
Wind Speed N 3 mph
Barometer 30.24 in (1024.0 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Nov 5:56 am EST
Extended Forecast for

East Setauket NYSimilar City Names

  • Today

    Today: Mostly sunny, with a high near 46. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 46 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 36. Calm wind.

    Low: 36 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, with a high near 54. Light south wind becoming southwest 5 to 9 mph in the morning.

    High: 54 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 50 percent chance of rain. Cloudy, with a low around 43. Southwest wind around 6 mph becoming northwest after midnight.

    Low: 43 °F

    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 1pm. Partly sunny, with a steady temperature around 47. North wind around 10 mph.

    High: 47 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 46. Northeast wind around 6 mph becoming calm in the afternoon.
Tonight
Increasing clouds, with a low around 36. Calm wind.
Friday
Mostly cloudy, with a high near 54. Light south wind becoming southwest 5 to 9 mph in the morning.
Friday Night
A 50 percent chance of rain. Cloudy, with a low around 43. Southwest wind around 6 mph becoming northwest after midnight.
Saturday
A 20 percent chance of rain before 1pm. Partly sunny, with a steady temperature around 47. North wind around 10 mph.
Saturday Night
Partly cloudy, with a low around 35.
Sunday
Mostly sunny, with a high near 48.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 53.
Monday Night
Mostly cloudy, with a low around 39.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
Tuesday Night
Rain likely. Cloudy, with a low around 45. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NYSimilar City Names
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
12:34 am EST Nov 20, 2025
Forecast Valid:
6am EST Nov 20, 2025-6pm EST Nov 26, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation