National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

57°F

14°C

Humidity 74%
Wind Speed SE 3 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 15 Oct 11:56 pm EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: A 30 percent chance of showers after 5am. Mostly cloudy, with a temperature rising to around 57 by 4am. Southeast wind 8 to 10 mph.

    Low: 53 °F⇑

    Chance
    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 2pm. High near 71. Southwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then showers after 8pm. Low around 46. Southwest wind 10 to 16 mph becoming northwest after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Showers

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 54. Breezy, with a north wind 17 to 20 mph.

    High: 54 °F

    Cloudy and
    Breezy then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. North wind 11 to 16 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers after 5am. Mostly cloudy, with a temperature rising to around 57 by 4am. Southeast wind 8 to 10 mph.
Friday
Showers, with thunderstorms also possible after 2pm. High near 71. Southwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
A slight chance of showers and thunderstorms, then showers after 8pm. Low around 46. Southwest wind 10 to 16 mph becoming northwest after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 54. Breezy, with a north wind 17 to 20 mph.
Saturday Night
Mostly clear, with a low around 41. North wind 11 to 16 mph.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 61.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Mostly sunny, with a high near 61.
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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:
2:36 pm EDT Oct 15, 2026
Forecast Valid:
12am EDT Oct 16, 2026-6pm EDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

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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