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- Latest Briefing: Major Winter Storm Sunday into Monday
- Winter Storm Warning in Effect 3AM Sunday to 6PM Monday
- Cold Weather Advisory in Effect 10PM Friday Night Until 12PM Saturday
- Learn More About Winter Hazards and Preparedness
- Students: Interested in Volunteering for NWS New York, NY this Summer?
Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
34°F
1°C
| Humidity | 31% |
| Wind Speed | W 12 mph |
| Barometer | 30.08 in (1018.7 mb) |
| Dewpoint | 6°F (-14°C) |
| Visibility | 10.00 mi |
| Wind Chill | 25°F (-4°C) |
| Last update | 23 Jan 4:56 pm EST |
Extended Forecast for
Brentwood NY
Cold Weather Advisory January 23, 10:00pm until January 24, 12:00pm
Winter Storm Warning January 25, 03:00am until January 26, 06:00pm
Tonight
Low: 9 °F
Partly Cloudy
Saturday
High: 19 °F
Cold
Saturday Night
Low: 12 °F
Mostly Cloudy
then Chance
SnowSunday
High: 30 °F
Heavy Snow
Sunday Night
Low: 28 °F
Wintry Mix
Monday
High: 30 °F⇓
Snow Likely
Monday Night
Low: 11 °F
Partly Cloudy
Tuesday
High: 22 °F
Mostly Sunny
Tuesday Night
Low: 10 °F
Partly Cloudy
Detailed Forecast
Tonight
Partly cloudy, with a low around 9. Wind chill values between -5 and 5. Northwest wind 13 to 17 mph.
Saturday
Mostly sunny and cold, with a high near 19. Wind chill values between -5 and 5. Northwest wind 10 to 15 mph.
Saturday Night
A 30 percent chance of snow, mainly after 4am. Cloudy, with a low around 12. Wind chill values between 5 and 10. North wind 3 to 5 mph.
Sunday
Snow, mainly after 7am. The snow could be heavy at times. High near 30. Wind chill values between 5 and 15. Northeast wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of 8 to 12 inches possible.
Sunday Night
Snow and sleet before 10pm, then snow and sleet, possibly mixed with freezing rain between 10pm and 4am, then snow and sleet likely after 4am. The snow could be heavy at times. Steady temperature around 28. Northeast wind 13 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow and sleet accumulation of 1 to 3 inches possible.
Monday
Snow likely, mainly before 1pm. Cloudy, with a temperature rising to near 30 by 11am, then falling to around 26 during the remainder of the day. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday Night
Partly cloudy, with a low around 11.
Tuesday
Mostly sunny, with a high near 22.
Tuesday Night
Partly cloudy, with a low around 10.
Wednesday
Mostly sunny, with a high near 23.
Wednesday Night
Mostly cloudy, with a low around 10.
Thursday
Partly sunny, with a high near 23.
Thursday Night
Partly cloudy, with a low around 9.
Friday
Mostly sunny, with a high near 24.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Brentwood NY
40.78°N 73.24°W (Elev. 66 ft)
40.78°N 73.24°W (Elev. 66 ft)
12:58 pm EST Jan 23, 2026
5pm EST Jan 23, 2026-6pm EST Jan 30, 2026
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Hourly Weather Forecast
