Brentwood, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brentwood, a community in Suffolk County, New York.
This Afternoon
80°F
Sunny
Sunny. High near 80, with temperatures falling to around 78 in the afternoon. North wind around 8 mph.
7-day forecast for Brentwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 8 mph N | 0% |
| Tonight | 56°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Saturday | 70°F | Mostly Sunny | 10 mph E | 0% |
| Saturday Night | 58°F | Partly Cloudy | 5 to 8 mph SE | 4% |
| Sunday | 71°F | Showers And Thunderstorms | 7 to 15 mph S | 78% |
| Sunday Night | 60°F | Showers And Thunderstorms | 7 to 12 mph W | 90% |
| Monday | 69°F | Rain Showers Likely | 12 to 15 mph NE | 61% |
| Monday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Tuesday | 65°F | Chance Rain Showers | 17 mph NE | 27% |
| Tuesday Night | 54°F | Chance Rain Showers then Mostly Cloudy | 16 mph NE | 27% |
| Wednesday | 65°F | Slight Chance Rain Showers | 16 to 20 mph NE | 16% |
| Wednesday Night | 54°F | Chance Rain Showers | 15 to 18 mph NE | 36% |
| Thursday | 64°F | Chance Rain Showers | 20 mph NE | 36% |
| Thursday Night | 53°F | Chance Rain Showers | 13 to 17 mph NE | 36% |
Forecast source: National Weather Service (api.weather.gov) for Brentwood (40.784, -73.252). Updated through the day.
Growing snapshot for Brentwood
Last spring frost
Apr 10
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7b
More local growing data for Brentwood: nearby ZIP 11717 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Islip Li Macarthur Ap, Ny (7.9 mi from Brentwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.