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.

Fog/Mist

49°F

9°C

Humidity 86%
Wind Speed Calm
Barometer 29.90 in (1012.5 mb)
Dewpoint 45°F (7°C)
Visibility 6.00 mi
Last update 22 Nov 1:56 am EST
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: Rain likely, mainly after 4am. Cloudy, with a low around 43. Light west wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Rain Likely

  • Saturday

    Saturday: Rain likely, mainly before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Rain Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 34. North wind 5 to 9 mph.

    Low: 34 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 49. Light and variable wind becoming southwest 5 to 10 mph in the morning.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. West wind 9 to 16 mph.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 39.

    Low: 39 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 56.

    High: 56 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: Rain. Low around 49. Chance of precipitation is 80%.

    Low: 49 °F

    Rain

Detailed Forecast

Overnight
Rain likely, mainly after 4am. Cloudy, with a low around 43. Light west wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain likely, mainly before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Partly cloudy, with a low around 34. North wind 5 to 9 mph.
Sunday
Mostly sunny, with a high near 49. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 39. West wind 9 to 16 mph.
Monday
Sunny, with a high near 52.
Monday Night
Increasing clouds, with a low around 39.
Tuesday
Cloudy, with a high near 56.
Tuesday Night
Rain. Low around 49. Chance of precipitation is 80%.
Wednesday
A 50 percent chance of rain. Mostly cloudy, with a high near 59.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 42.
Thanksgiving Day
Partly sunny, with a high near 51.
Thursday Night
Partly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
1:00 am EST Nov 22, 2025
Forecast Valid:
2am EST Nov 22, 2025-6pm EST Nov 28, 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