California firefighters battling several wildfires that have destroyed dozens of structures and forced thousands of residents to evacuate will get some relief as temperatures cool from scorching levels later this week, the National Weather Service said.

"Starting Monday we're going to see a gradual cool down, as we shave just a few degrees off each day until about midweek it gets to something like normal, in the mid-90s (Fahrenheit) inland and 80s at the coast," said Jim Hayes of the NWS Weather Prediction Center in College Park, Maryland.

"Today it's going to be another miserable, hot, dry day," he said early Sunday, noting that temperatures in some areas inland will hit triple digits.