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.

Overcast

72°F

22°C

Humidity 84%
Wind Speed E 6 mph
Barometer 30.10 in (1019.2 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 12 Jul 11:56 pm EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 70. Light east wind.

    Low: 70 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 79. East wind 5 to 9 mph.

    High: 79 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 71. Southeast wind around 6 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. South wind 3 to 8 mph.

    High: 81 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 72. South wind 3 to 6 mph. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 70. Light east wind.
Sunday
Partly sunny, with a high near 79. East wind 5 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 71. Southeast wind around 6 mph becoming calm in the evening.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. South wind 3 to 8 mph.
Monday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 72. South wind 3 to 6 mph. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 85.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 74.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 85.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
6:14 pm EDT Jul 12, 2025
Forecast Valid:
12am EDT Jul 13, 2025-6pm EDT Jul 19, 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