Brentwood, CA Weather & Growing Conditions
This Afternoon
92°F
Sunny
Sunny, with a high near 92. West northwest wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 92°F | Sunny | 8 mph WNW | 0% |
| Tonight | 58°F | Partly Cloudy | 2 to 7 mph W | 0% |
| Sunday | 84°F | Partly Sunny | 2 to 7 mph NW | 0% |
| Sunday Night | 58°F | Mostly Cloudy | 6 mph WSW | 0% |
| Monday | 86°F | Sunny | 5 to 8 mph WSW | 0% |
| Monday Night | 57°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Tuesday | 87°F | Sunny | 2 to 7 mph W | 0% |
| Tuesday Night | 58°F | Mostly Clear | 0 to 7 mph W | 0% |
| Wednesday | 94°F | Sunny | 0 to 5 mph NW | 0% |
| Wednesday Night | 63°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Thursday | 97°F | Sunny | 0 to 6 mph NNW | 0% |
| Thursday Night | 63°F | Mostly Clear | 0 to 6 mph WSW | 0% |
| Friday | 91°F | Sunny | 2 to 9 mph WSW | 0% |
| Friday Night | 60°F | Mostly Clear | 3 to 9 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Brentwood, CA
Last spring frost
Jan 12
First fall frost
Dec 19
Growing season
343 days
Hardiness zone
9b
Explore more for Brentwood, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Antioch Pumping Plt #3, Ca (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.