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

49°F

9°C

Humidity 59%
Wind Speed SW 10 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 23 Nov 1:56 pm EST
Extended Forecast for

West Sayville NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 49. West wind 11 to 13 mph, with gusts as high as 23 mph.

    High: 49 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly clear, with a low around 38. West wind 11 to 13 mph, with gusts as high as 28 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50. Northwest wind 7 to 14 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 39. Calm wind becoming southwest around 6 mph after midnight.

    Low: 39 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 40 percent chance of rain after 1pm. Cloudy, with a high near 57. South wind 6 to 13 mph.

    High: 57 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain. Steady temperature around 51. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: A 40 percent chance of rain. Cloudy, with a high near 59.

    High: 59 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 49. West wind 11 to 13 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 38. West wind 11 to 13 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 50. Northwest wind 7 to 14 mph.
Monday Night
Increasing clouds, with a low around 39. Calm wind becoming southwest around 6 mph after midnight.
Tuesday
A 40 percent chance of rain after 1pm. Cloudy, with a high near 57. South wind 6 to 13 mph.
Tuesday Night
Rain. Steady temperature around 51. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 59.
Wednesday Night
A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 38.
Thanksgiving Day
Mostly sunny, with a high near 44.
Thursday Night
Mostly clear, with a low around 30. Breezy.
Friday
Mostly sunny, with a high near 41. Breezy.
Friday Night
Mostly clear, with a low around 31.
Saturday
Mostly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
West Sayville NY
 40.74°N 73.1°W (Elev. 30 ft)
Last Update:
2:01 pm EST Nov 23, 2025
Forecast Valid:
2pm EST Nov 23, 2025-6pm EST Nov 29, 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