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.

A Few Clouds

90°F

32°C

Humidity 35%
Wind Speed W 14 G 21 mph
Barometer 29.83 in (1010.0 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 3 Jul 12:56 pm EDT
Extended Forecast for

Sayville NY

  • This Afternoon

    This Afternoon: A slight chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Sunny, with a high near 84. Southwest wind 7 to 10 mph. Chance of precipitation is 30%.

    High: 84 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 68. West wind around 6 mph.

    Low: 68 °F

    Chance
    Showers then
    Mostly Clear

  • Independence Day

    Independence Day: Sunny, with a high near 82. North wind around 7 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. West wind around 6 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Sunny, with a high near 84. Southwest wind 7 to 10 mph. Chance of precipitation is 30%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 68. West wind around 6 mph.
Independence Day
Sunny, with a high near 82. North wind around 7 mph.
Friday Night
Mostly clear, with a low around 67. West wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 71.
Monday
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 81.
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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:
3:15 am EDT Jul 3, 2025
Forecast Valid:
12pm EDT Jul 3, 2025-6pm EDT Jul 9, 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