Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

31°F

-1°C

Humidity 67%
Wind Speed NE 7 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 27 Feb 12:56 am EST
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: Mostly clear, with a low around 23. Light north wind.

    Low: 23 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 41. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. Light south wind.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 48. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 48 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 30. Light and variable wind.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: Scattered snow showers before 1pm.  Cloudy through mid morning, then gradual clearing, with a high near 38. Chance of precipitation is 40%.

    High: 38 °F

    Scattered
    Snow Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 28.

    High: 28 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 23. Light north wind.
Friday
Sunny, with a high near 41. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 29. Light south wind.
Saturday
Mostly sunny, with a high near 48. Calm wind becoming southwest 5 to 7 mph in the morning.
Saturday Night
Mostly cloudy, with a low around 30. Light and variable wind.
Sunday
Scattered snow showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 38. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 17.
Monday
Mostly cloudy, with a high near 28.
Monday Night
Mostly cloudy, with a low around 20.
Tuesday
A chance of rain and snow after 1pm. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Tuesday Night
Rain likely. Cloudy, with a low around 30. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
Mostly cloudy, with a high near 45.
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood NY
 40.78°N 73.24°W (Elev. 66 ft)
12:50 am EST Feb 27, 2026
1am EST Feb 27, 2026-6pm EST Mar 5, 2026
 
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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