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

57°F

14°C

Humidity 96%
Wind Speed N 14 mph
Barometer 29.80 in (1009.1 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 11 Oct 10:56 pm EDT
Extended Forecast for

Brentwood NY

  • Tonight

    Tonight: Rain likely and possibly a thunderstorm before midnight, then a chance of rain and thunderstorms after midnight. Cloudy, with a low around 56. Northeast wind 11 to 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Rain Likely

  • Columbus Day

    Columbus Day: Mostly cloudy through mid morning, then gradual clearing, with a high near 71. Northeast wind 8 to 11 mph.

    High: 71 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. Light north wind.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 62. Southwest wind around 9 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Rain likely and possibly a thunderstorm before midnight, then a chance of rain and thunderstorms after midnight. Cloudy, with a low around 56. Northeast wind 11 to 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Columbus Day
Mostly cloudy through mid morning, then gradual clearing, with a high near 71. Northeast wind 8 to 11 mph.
Monday Night
Mostly clear, with a low around 56. Light north wind.
Tuesday
Mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 9 mph in the morning.
Tuesday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 62. Southwest wind around 9 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Mostly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 51.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 48. Breezy.
Saturday
Partly sunny, with a high near 56. Breezy.
Saturday Night
Mostly cloudy, with a low around 38.
Sunday
Mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.27°W (Elev. 98 ft)
Last Update:
3:33 pm EDT Oct 11, 2026
Forecast Valid:
11pm EDT Oct 11, 2026-6pm EDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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