National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

64°F

18°C

Humidity 87%
Wind Speed Calm
Barometer 30.18 in (1022.0 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 25 Jul 12:56 am EDT
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. Northeast wind 6 to 13 mph becoming southeast in the afternoon.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61. Southeast wind around 6 mph becoming light and variable after midnight.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 83. Northeast wind 7 to 9 mph becoming east in the afternoon.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65. Southeast wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.

    High: 81 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 61. Calm wind.
Saturday
Sunny, with a high near 81. Northeast wind 6 to 13 mph becoming southeast in the afternoon.
Saturday Night
Mostly clear, with a low around 61. Southeast wind around 6 mph becoming light and variable after midnight.
Sunday
Sunny, with a high near 83. Northeast wind 7 to 9 mph becoming east in the afternoon.
Sunday Night
Mostly clear, with a low around 65. Southeast wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 84.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Tuesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 68.
Friday
Mostly sunny, with a high near 85.
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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:
2:50 pm EDT Jul 24, 2026
Forecast Valid:
1am EDT Jul 25, 2026-6pm EDT Jul 31, 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