The Latest on California wildfires (all times local):

6:05 a.m.

Crews working around the clock took advantage of cooler overnight weather as they braced for a spike in daytime temperatures near California's Big Sur where a wildfire has destroyed 34 homes and killed a bulldozer driver working to contain the blaze.

Forecasters say humidity is expected to drop Thursday while temperatures will rise into the upper 80s. However the more than 3,000 firefighters could get a break if winds remain light in Monterey County. At least 34 structures have been destroyed in the fire that has charred 37 square miles (93 sq. kilometers). It's just 10 percent contained

To the south, a wildfire that gutted 18 homes on the northern edge of Los Angeles County was 40 percent contained late Wednesday. It has burned 60 square miles (154 square kilometers) of brush, mostly in forest land near Santa Clarita.