Brentwood, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brentwood, a community in Suffolk County, New York.
Today
72°F
Sunny
Sunny. High near 72, with temperatures falling to around 64 in the afternoon. Southwest wind 5 to 12 mph.
7-day forecast for Brentwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 5 to 12 mph SW | 0% |
| Tonight | 58°F | Partly Cloudy | 7 mph S | 0% |
| Thursday | 71°F | Mostly Cloudy | 7 to 12 mph S | 6% |
| Thursday Night | 60°F | Showers And Thunderstorms | 5 to 10 mph SW | 75% |
| Friday | 68°F | Showers And Thunderstorms | 6 mph S | 95% |
| Friday Night | 54°F | Showers And Thunderstorms | 5 mph W | 83% |
| Saturday | 64°F | Mostly Sunny | 6 to 9 mph NW | 12% |
| Saturday Night | 43°F | Slight Chance Light Rain | 9 mph W | 22% |
| Sunday | 59°F | Slight Chance Light Rain then Mostly Sunny | 10 mph NW | 15% |
| Sunday Night | 41°F | Partly Cloudy | 9 mph W | 6% |
| Monday | 58°F | Sunny | 9 to 15 mph W | 13% |
| Monday Night | 40°F | Mostly Clear | 7 to 10 mph W | 13% |
| Tuesday | 60°F | Sunny | 9 to 14 mph W | 5% |
| Tuesday Night | 41°F | Mostly Clear | 10 mph W | 2% |
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 Nov 4, 2026.