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.

Light Rain

N/A

Humidity NA
Wind Speed W 7 mph
Barometer 29.77 in
Dewpoint N/A
Visibility 9.00 mi
Last update 11 Jan 4:56 am EST
Extended Forecast for

Brentwood NY

  • Overnight

    Overnight: A 30 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 41. West wind around 6 mph.

    Low: 41 °F

    Chance Rain
    and Patchy
    Fog

  • Sunday

    Sunday: A chance of rain before 10am, then a chance of rain and snow showers after 4pm. Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 46. West wind 6 to 13 mph. Chance of precipitation is 40%.

    High: 46 °F

    Chance Rain
    and Patchy
    Fog then
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of rain and snow showers before 7pm. Mostly clear, with a low around 28. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 30%.

    Low: 28 °F

    Breezy.
    Chance
    Rain/Snow
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 40. Wind chill values between 20 and 30. West wind 11 to 14 mph, with gusts as high as 25 mph.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31. Southwest wind 7 to 9 mph.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 47.

    High: 47 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Cloudy then
    Chance Rain

Detailed Forecast

Overnight
A 30 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 41. West wind around 6 mph.
Sunday
A chance of rain before 10am, then a chance of rain and snow showers after 4pm. Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 46. West wind 6 to 13 mph. Chance of precipitation is 40%.
Sunday Night
A chance of rain and snow showers before 7pm. Mostly clear, with a low around 28. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 30%.
Monday
Sunny, with a high near 40. Wind chill values between 20 and 30. West wind 11 to 14 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 31. Southwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Cloudy, with a high near 47.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 31.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 39.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 21.
Friday
Partly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 38.
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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:
1:40 am EST Jan 11, 2026
Forecast Valid:
5am EST Jan 11, 2026-6pm EST Jan 17, 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