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.

Fair

30°F

-1°C

Humidity 56%
Wind Speed N 16 mph
Barometer 30.52 in (1033.4 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 8 Apr 4:56 am EDT
Extended Forecast for

Brentwood NY

  • Today

    Today: Sunny, with a high near 48. Wind chill values between 20 and 30 early. North wind 9 to 11 mph becoming southeast in the afternoon.

    High: 48 °F

    Sunny

  • Tonight

    Tonight: Patchy frost after midnight. Otherwise, mostly clear, with a low around 32. South wind 3 to 7 mph.

    Low: 32 °F

    Clear then
    Patchy Frost

  • Thursday

    Thursday: Patchy frost before 9am. Otherwise, sunny, with a high near 51. South wind 5 to 9 mph.

    High: 51 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Patchy frost after 4am. Otherwise, mostly clear, with a low around 38. South wind around 6 mph becoming calm after midnight.

    Low: 38 °F

    Mostly Clear
    then Patchy
    Frost

  • Friday

    Friday: Patchy frost before 7am. Otherwise, sunny, with a high near 57. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 57 °F

    Patchy Frost
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 60.

    High: 60 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 41.

    Low: 41 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 48. Wind chill values between 20 and 30 early. North wind 9 to 11 mph becoming southeast in the afternoon.
Tonight
Patchy frost after midnight. Otherwise, mostly clear, with a low around 32. South wind 3 to 7 mph.
Thursday
Patchy frost before 9am. Otherwise, sunny, with a high near 51. South wind 5 to 9 mph.
Thursday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 38. South wind around 6 mph becoming calm after midnight.
Friday
Patchy frost before 7am. Otherwise, sunny, with a high near 57. Calm wind becoming south 5 to 9 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 46.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 60.
Saturday Night
Clear, with a low around 41.
Sunday
Sunny, with a high near 55.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Mostly cloudy, with a high near 63.
Monday Night
Mostly cloudy, with a low around 53.
Tuesday
Partly sunny, with a high near 69.
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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:
3:28 am EDT Apr 8, 2026
Forecast Valid:
5am EDT Apr 8, 2026-6pm EDT Apr 14, 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