A heat advisory is in effect for the Bay Area from 11 a.m. to 7 p.m. Friday, according to weather officials.
Temperatures along the coast and around the bay are expected to range from the low 80s to low 90s, NBC Bay Area Meteorologist Kari Hall said. Some inland spots, such as Concord, Danville and Livermore, will likely soar into the low 100s.
A summer Spare the Air alert on Thursday was extended into Friday and Saturday as well, weather officials said.
Temperatures will start dropping on Saturday and continue to fall into early next week.