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

59°F

15°C

Humidity 83%
Wind Speed NE 6 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 15 Jun 2:56 am EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: Cloudy, with a low around 57. Northeast wind around 8 mph.

    Low: 57 °F

    Cloudy

  • Sunday

    Sunday: A 20 percent chance of light rain between 11am and 2pm. Mostly cloudy, with a high near 67. Northeast wind around 10 mph.

    High: 67 °F

    Slight Chance
    Light Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of light rain after 11pm. Mostly cloudy, with a low around 59. East wind around 6 mph.

    Low: 59 °F

    Slight Chance
    Light Rain

  • Monday

    Monday: Mostly cloudy, with a high near 69. East wind 8 to 10 mph.

    High: 69 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59. East wind 5 to 7 mph.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 76.

    High: 76 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Cloudy, with a low around 57. Northeast wind around 8 mph.
Sunday
A 20 percent chance of light rain between 11am and 2pm. Mostly cloudy, with a high near 67. Northeast wind around 10 mph.
Sunday Night
A 20 percent chance of light rain after 11pm. Mostly cloudy, with a low around 59. East wind around 6 mph.
Monday
Mostly cloudy, with a high near 69. East wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 59. East wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 71.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 62.
Wednesday
Mostly cloudy, with a high near 76.
Wednesday Night
Mostly cloudy, with a low around 66.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Friday
Mostly sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 63.
Saturday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.74°N 73.1°W (Elev. 30 ft)
Last Update:
3:11 am EDT Jun 15, 2025
Forecast Valid:
3am EDT Jun 15, 2025-6pm EDT Jun 21, 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