So far, at least 17 people have died, more than 180 people are missing and 100 people are being treated in hospital for smoke-related injuries.
According to Deadline, filming was shut down yesterday as the popular Netflix series films in the nearby city of Vallejo.
Deadline also reports that some of the 13 Reasons Why cast and crew were flown home for the break, "since many of them live in the fire zones."
Lead star Dylan Minnette has sent his support to the victims via Twitter.
"We film 13 Reasons Why in many of the areas in NorCal affected by these devastating fires. Sending love and thoughts to everyone involved."
Devin Druid (Tyler) also shared an emotional message on Twitter.
"The NorCal/Bay Area has been my home for almost a year while filming @13ReasonsWhy. My heart goes out to all affected by these awful fires," he wrote.
"Thread of orgs working to help victims of the #northbayfires. I can't check the validity of all atm, but will delete any that take advantage."
Thoughts and prayers go out to the victims and their families. <3