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

51°F

11°C

Humidity 52%
Wind Speed N 10 mph
Barometer 30.12 in (1019.8 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 12 May 1:56 am EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: A chance of sprinkles. Partly cloudy, with a low around 46. North wind around 6 mph.

    Low: 46 °F

    Chance
    Sprinkles

  • Tuesday

    Tuesday: Sunny, with a high near 65. North wind around 7 mph becoming west in the afternoon.

    High: 65 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 50. Southwest wind around 7 mph.

    Low: 50 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Cloudy, with a high near 64. South wind 10 to 18 mph, with gusts as high as 32 mph.

    High: 64 °F

    Cloudy then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 5am, then showers after 5am. Low around 52. South wind 13 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 52 °F

    Showers

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 66 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.

    Low: 50 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers after 8am. Partly sunny, with a high near 65.

    High: 65 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of sprinkles. Partly cloudy, with a low around 46. North wind around 6 mph.
Tuesday
Sunny, with a high near 65. North wind around 7 mph becoming west in the afternoon.
Tuesday Night
Increasing clouds, with a low around 50. Southwest wind around 7 mph.
Wednesday
A 30 percent chance of showers after 2pm. Cloudy, with a high near 64. South wind 10 to 18 mph, with gusts as high as 32 mph.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 5am, then showers after 5am. Low around 52. South wind 13 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers after 8am. Partly sunny, with a high near 65.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.76°N 73.07°W (Elev. 30 ft)
Last Update:
8:30 pm EDT May 11, 2026
Forecast Valid:
2am EDT May 12, 2026-6pm EDT May 18, 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