Cajon High School, Lankershim, Thompson and Hillside elementary schools were the facilities that were impacted by the weekend thefts.
The spokesperson for the San Bernardino City Unified School District Linda Bardere had no information on the burglary at Hillside elementary school but said the libraries at Cajon High School and Thompson Elementary were broken into Sunday.
"It appears that some computers were taken at the two schools," Bardere said. "And at Lankershim some copper wiring was taken."
Bardere didn't know if the copper wiring was taken from a portable or stationary classroom.
There have been 79 burglaries throughout the school district this year, but 41 of those occurred since Sept. 1, she said.
Bardere said the cost of damages from the burglaries so far this year is $177,148.
The superintendent, Dale Marsden, who is on vacation was not available for comment.
The School district chief of police Joesph Paulino has put the burglaries high on his priority list.
"This is an epidemic that isn't just affecting the district," he said. "But we are the ones charged with educating the children of the community, and we're putting forth a wider scaled patrol in attempts to curb this from happening again."
In July, burglars hit 11 schools taking thousands of dollars in school property, including 16 computers from a classroom at Hillside Elementary School and eight computers from Golden Valley Middle School library, according to school district police.
Chief Paulino said he is driven to stop the burglaries so the students may once again have the tools needed to succeed and the offenders are caught.
"I have committed more patrols on the school district properties to try and put an end to these burglaries."