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.

Fog

44°F

7°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 44°F (7°C)
Visibility 0.13 mi
Wind Chill41°F (5°C)
Last update 10 Mar 9:56 am EDT
Extended Forecast for

Brentwood NY

  • Today

    Today: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 64. South wind 3 to 7 mph.

    High: 64 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. Light south wind.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 62. Light southeast wind becoming south 5 to 9 mph in the morning.

    High: 62 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 48. Southwest wind 8 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    Low: 48 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of rain before 5pm, then a chance of rain and snow. Cloudy, with a temperature falling to around 43 by 5pm. Northwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 50 °F⇓

    Chance Rain
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.

    Low: 29 °F

    Chance Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 45.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 64. South wind 3 to 7 mph.
Tonight
Mostly cloudy, with a low around 40. Light south wind.
Wednesday
Mostly cloudy, with a high near 62. Light southeast wind becoming south 5 to 9 mph in the morning.
Wednesday Night
A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 48. Southwest wind 8 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Thursday
A chance of rain before 5pm, then a chance of rain and snow. Cloudy, with a temperature falling to around 43 by 5pm. Northwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Thursday Night
A 30 percent chance of snow before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.
Friday
Increasing clouds, with a high near 45.
Friday Night
Mostly cloudy, with a low around 35.
Saturday
Mostly sunny, with a high near 48.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Cloudy, with a high near 51.
Sunday Night
Rain. Low around 40. Chance of precipitation is 80%.
Monday
Rain. High near 51. Chance of precipitation is 80%.
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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:
2:07 am EDT Mar 10, 2026
Forecast Valid:
10am EDT Mar 10, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation