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.

Overcast

63°F

17°C

Humidity 93%
Wind Speed E 6 mph
Barometer 30.16 in (1021.2 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 16 Jun 8:56 am EDT
Extended Forecast for

5 Miles SSE West Sayville NY

  • Today

    Today: A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 65. East wind around 15 mph.

    High: 65 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Rain

  • Tonight

    Tonight: A 20 percent chance of light rain. Mostly cloudy, with a low around 62. East wind 7 to 11 mph.

    Low: 62 °F

    Slight Chance
    Light Rain

  • Tuesday

    Tuesday: Cloudy, with a high near 66. East wind around 10 mph.

    High: 66 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Cloudy, with a low around 64. South wind around 7 mph.

    Low: 64 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 72. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers between 8pm and 2am. Partly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 65. East wind around 15 mph.
Tonight
A 20 percent chance of light rain. Mostly cloudy, with a low around 62. East wind 7 to 11 mph.
Tuesday
Cloudy, with a high near 66. East wind around 10 mph.
Tuesday Night
A 50 percent chance of showers. Cloudy, with a low around 64. South wind around 7 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 72. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 67.
Juneteenth
Mostly sunny, with a high near 77.
Thursday Night
A chance of showers between 8pm and 2am. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
Sunny, with a high near 74.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE West Sayville NY
 40.67°N 73.06°W (Elev. 0 ft)
Last Update:
6:40 pm EDT Jun 15, 2025
Forecast Valid:
9am EDT Jun 16, 2025-6pm EDT Jun 22, 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