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.

Mostly Cloudy

75°F

24°C

Humidity 79%
Wind Speed N 9 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 18 Sep 8:56 am EDT
Extended Forecast for

2 Miles SSE Sayville NY

  • Today

    Today: Mostly sunny, with a high near 80. North wind 8 to 10 mph.

    High: 80 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 56. Northeast wind 8 to 13 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 69. Northeast wind 9 to 11 mph.

    High: 69 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. East wind around 8 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Southeast wind 8 to 11 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers. Low around 61. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.

    Low: 61 °F

    Showers

  • Monday

    Monday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 57. Breezy.

    Low: 57 °F

    Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.

    High: 65 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Today
Mostly sunny, with a high near 80. North wind 8 to 10 mph.
Tonight
Partly cloudy, with a low around 56. Northeast wind 8 to 13 mph.
Saturday
Mostly sunny, with a high near 69. Northeast wind 9 to 11 mph.
Saturday Night
Mostly cloudy, with a low around 58. East wind around 8 mph.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Southeast wind 8 to 11 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers. Low around 61. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.
Monday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 57. Breezy.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 55. Breezy.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 65. Windy.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 55. Breezy.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 66. Breezy.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
5:16 am EDT Sep 18, 2026
Forecast Valid:
9am EDT Sep 18, 2026-6pm EDT Sep 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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