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

47°F

8°C

Humidity 39%
Wind Speed W 9 mph
Barometer 30.11 in (1019.7 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 18 Nov 11:56 am EST
Extended Forecast for

5 Miles SSE West Sayville NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 47. West wind 15 to 17 mph.

    High: 47 °F

    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of rain after 1am. Increasing clouds, with a low around 42. West wind 6 to 11 mph.

    Low: 42 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 48. North wind 5 to 7 mph.

    High: 48 °F

    Slight Chance
    Rain

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. North wind 6 to 9 mph.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 50. Northeast wind 7 to 9 mph.

    High: 50 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 50.

    High: 50 °F

    Chance Rain

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 47. West wind 15 to 17 mph.
Tonight
A 40 percent chance of rain after 1am. Increasing clouds, with a low around 42. West wind 6 to 11 mph.
Wednesday
A 20 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 48. North wind 5 to 7 mph.
Wednesday Night
Mostly cloudy, with a low around 42. North wind 6 to 9 mph.
Thursday
Partly sunny, with a high near 50. Northeast wind 7 to 9 mph.
Thursday Night
Mostly cloudy, with a low around 48.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 50.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 52.
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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:
5:29 am EST Nov 18, 2025
Forecast Valid:
12pm EST Nov 18, 2025-6pm EST Nov 24, 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