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.

Rain Fog/Mist

60°F

16°C

Humidity 93%
Wind Speed E 13 mph
Barometer 30.06 in (1017.8 mb)
Dewpoint 58°F (14°C)
Visibility 2.50 mi
Last update 11 Oct 4:56 pm EDT
Extended Forecast for

Brentwood NY

  • This Afternoon

    This Afternoon: Rain. Steady temperature around 60. East wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Rain

  • Tonight

    Tonight: Rain and possibly a thunderstorm, mainly before midnight, then a chance of rain and thunderstorms after midnight. Low around 56. Breezy, with a northeast wind 11 to 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 56 °F

    Rain and
    Breezy then
    Chance Rain

  • Columbus Day

    Columbus Day: Cloudy through mid morning, then gradual clearing, with a high near 71. North 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: Sunny through mid morning, then becoming mostly cloudy, with a high near 70. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 70 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    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

Detailed Forecast

This Afternoon
Rain. Steady temperature around 60. East wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain and possibly a thunderstorm, mainly before midnight, then a chance of rain and thunderstorms after midnight. Low around 56. Breezy, with a northeast wind 11 to 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Columbus Day
Cloudy through mid morning, then gradual clearing, with a high near 71. North wind 8 to 11 mph.
Monday Night
Mostly clear, with a low around 56. Light north wind.
Tuesday
Sunny through mid morning, then becoming mostly cloudy, with a high near 70. Light and variable wind becoming south 5 to 9 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 62.
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. 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 57. Breezy.
Saturday Night
Mostly cloudy, with a low around 38.
Sunday
Mostly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
3:33 pm EDT Oct 11, 2026
Forecast Valid:
5pm EDT Oct 11, 2026-6pm EDT Oct 18, 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