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.

Partly Cloudy

72°F

22°C

Humidity 68%
Wind Speed NW 8 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 26 Aug 9:56 am EDT
Extended Forecast for

5 Miles SSE West Sayville NY

  • Today

    Today: Sunny, with a high near 77. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. South wind 11 to 13 mph.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 78. Breezy, with a south wind 13 to 20 mph.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms and
    Breezy

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind 10 to 17 mph. Chance of precipitation is 40%.

    Low: 72 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm. Partly sunny, with a high near 78. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 70.

    Low: 70 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 77. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Tonight
Partly cloudy, with a low around 72. South wind 11 to 13 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 78. Breezy, with a south wind 13 to 20 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind 10 to 17 mph. Chance of precipitation is 40%.
Friday
A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm. Partly sunny, with a high near 78. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 70.
Saturday
Partly sunny, with a high near 76.
Saturday Night
Partly cloudy, with a low around 70.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 74.
Tuesday
Mostly sunny, with a high near 80.
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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:
2:49 am EDT Aug 26, 2026
Forecast Valid:
10am EDT Aug 26, 2026-6pm EDT Sep 1, 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