Brentwood, CA Weather & Growing Conditions
Today
104°F
Sunny
Sunny, with a high near 104. West northwest wind 3 to 12 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 104°F | Sunny | 3 to 12 mph WNW | 0% |
| Tonight | 62°F | Clear | 2 to 10 mph WNW | 0% |
| Wednesday | 101°F | Sunny | 3 to 10 mph WNW | 0% |
| Wednesday Night | 62°F | Clear | 2 to 10 mph W | 0% |
| Thursday | 99°F | Sunny | 2 to 12 mph W | 0% |
| Thursday Night | 64°F | Clear | 2 to 12 mph W | 0% |
| Friday | 104°F | Sunny | 2 to 12 mph W | 0% |
| Friday Night | 66°F | Clear | 2 to 12 mph W | 0% |
| Saturday | 103°F | Sunny | 2 to 10 mph W | 0% |
| Saturday Night | 67°F | Mostly Clear | 2 to 10 mph W | 0% |
| Sunday | 99°F | Sunny | 3 to 12 mph W | 0% |
| Sunday Night | 63°F | Clear | 3 to 12 mph WSW | 0% |
| Monday | 94°F | Sunny | 3 to 12 mph W | 0% |
| Monday Night | 60°F | Mostly Clear | 2 to 12 mph W | 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 Aug 4, 2026.