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

82°F

28°C

Humidity 58%
Wind Speed Vrbl 7 mph
Barometer 29.87 in (1011.3 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 13 Aug 1:56 pm EDT
Extended Forecast for

Sayville NY

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. West wind around 9 mph.

    High: 84 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Northwest wind around 6 mph.

    Low: 69 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 83. North wind 5 to 7 mph becoming south in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 67. Calm wind becoming northeast around 6 mph after midnight.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 80. Northeast wind around 8 mph.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers after 2pm. Partly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 70. Chance of precipitation is 80%.

    Low: 70 °F

    Showers

  • Monday

    Monday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 81.

    High: 81 °F

    Chance
    Showers then
    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. West wind around 9 mph.
Tonight
Partly cloudy, with a low around 69. Northwest wind around 6 mph.
Friday
Mostly sunny, with a high near 83. North wind 5 to 7 mph becoming south in the afternoon.
Friday Night
Partly cloudy, with a low around 67. Calm wind becoming northeast around 6 mph after midnight.
Saturday
Sunny, with a high near 80. Northeast wind around 8 mph.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
A 50 percent chance of showers after 2pm. Partly sunny, with a high near 80.
Sunday Night
A chance of showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 70. Chance of precipitation is 80%.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
Sunny, with a high near 80.
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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:
2:19 pm EDT Aug 13, 2026
Forecast Valid:
2pm EDT Aug 13, 2026-6pm EDT Aug 19, 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