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.

Fog/Mist

45°F

7°C

Humidity 100%
Wind Speed Calm
Barometer 30.29 in (1025.7 mb)
Dewpoint 45°F (7°C)
Visibility 1.25 mi
Last update 3 Apr 9:56 am EDT
Extended Forecast for

Brentwood NY

  • Today

    Today: Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 60. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 60 °F

    Areas Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 50 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 65. Light and variable wind becoming east 5 to 9 mph in the afternoon.

    High: 65 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 43 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 61. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 40.

    Low: 40 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

Today
Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 60. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Tonight
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Saturday
A 20 percent chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 65. Light and variable wind becoming east 5 to 9 mph in the afternoon.
Saturday Night
A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 7 to 10 mph, with gusts as high as 21 mph.
Sunday
Showers. High near 61. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 40.
Monday
Mostly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 51.
Tuesday Night
Mostly clear, with a low around 31.
Wednesday
Sunny, with a high near 48.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
Last Update:
2:20 am EDT Apr 3, 2026
Forecast Valid:
10am EDT Apr 3, 2026-6pm EDT Apr 9, 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