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.

Fair

43°F

6°C

Humidity 74%
Wind Speed W 7 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 10 Nov 12:56 am EST
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: Mostly clear, with a low around 39. West wind around 7 mph.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 60. Southwest wind 7 to 13 mph.

    High: 60 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 44. West wind around 8 mph.

    Low: 44 °F

    Clear

  • Veterans Day

    Veterans Day: Increasing clouds, with a high near 59. West wind 3 to 7 mph.

    High: 59 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 45. Light and variable wind.

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 59. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 59 °F

    Chance Rain
    then Rain
    Likely

  • Thursday Night

    Thursday Night: Rain. Low around 41. Chance of precipitation is 90%.

    Low: 41 °F

    Rain

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 50. Chance of precipitation is 70%.

    High: 50 °F

    Rain Likely

  • Friday Night

    Friday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 39. West wind around 7 mph.
Tuesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 60. Southwest wind 7 to 13 mph.
Tuesday Night
Clear, with a low around 44. West wind around 8 mph.
Veterans Day
Increasing clouds, with a high near 59. West wind 3 to 7 mph.
Wednesday Night
Mostly cloudy, with a low around 45. Light and variable wind.
Thursday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 59. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain. Low around 41. Chance of precipitation is 90%.
Friday
Rain likely. Mostly cloudy, with a high near 50. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Saturday
Mostly cloudy, with a high near 48.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Mostly sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.8°N 73.23°W (Elev. 98 ft)
Last Update:
1:34 am EST Nov 10, 2026
Forecast Valid:
1am EST Nov 10, 2026-6pm EST Nov 16, 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