The Sherpa Fire burning in southern Santa Barbara County is now 54 percent surrounded and remains at just over 12 square miles.
The National Weather Service says Monday will be the peak of the heat wave that has already brought record-breaking, triple-digit heat to the region.
Despite the conditions, firefighters reported a slight increase in containment of the 7,893-acre fire burning in rugged terrain along the Gaviota Coast since Wednesday, but 270 structures are still threatened.
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Authorities expect to fully contain the fire by Thursday, June 23.