About Brentwood, CA's Climate & Weather History

Brentwood is a city of approximately 59,000 people in California, United States. Located in the Pacific Time Zone at 37.9°N latitude.

In 2025, Brentwood recorded an average annual temperature of 61°F. The hottest temperatures reached 103°F in August; the coolest were 34°F in February. Total precipitation for the year was 19 inches, with the wettest month being February.