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

65°F

18°C

Humidity 47%
Wind Speed SW 3 mph
Barometer 29.69 in (1005.4 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 14 May 4:56 pm EDT
Extended Forecast for

Sayville NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 63. West wind around 5 mph.

    High: 63 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 51. Northwest wind 3 to 5 mph.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 64. Northwest wind around 8 mph.

    High: 64 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 53. Light and variable wind.

    Low: 53 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 70. Southwest wind 5 to 14 mph.

    High: 70 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 63. West wind around 5 mph.
Tonight
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 51. Northwest wind 3 to 5 mph.
Friday
A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 64. Northwest wind around 8 mph.
Friday Night
Mostly clear, with a low around 53. Light and variable wind.
Saturday
Sunny, with a high near 70. Southwest wind 5 to 14 mph.
Saturday Night
Partly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny, with a high near 76.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 59.
Thursday
A chance of showers. Partly sunny, with a high near 72.
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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:
2:22 pm EDT May 14, 2026
Forecast Valid:
5pm EDT May 14, 2026-6pm EDT May 21, 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