Historical weather data, all-time temperature records, and monthly climate averages for Brentwood, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Brentwood runs mild and mostly dry, with a typical high of 70° and just a 16% chance of rain. The date has swung from a sultry 87° back in 1960 to a chilly 35° low in 1975, so spring here still keeps you guessing.
Brentwood plays for keeps when the heat arrives — the all-time record of 117° set in June 1961 puts it firmly in Central Valley territory. Winters can bite too, with a record low of 18° in December 1972, and a single October storm once dumped over 3 inches of rain in a day.
Summer is the main event here, with highs pushing into the low 90s from early July through August before a gradual cool-down through fall. January is the coolest month at just 52°, and if you're hoping to dodge rain, aim for late spring through early fall — February is the wettest stretch of the year.