The National Weather Service issued an excessive heat warning for Thursday, forecasting that temperatures could soar to 109 degrees in some parts of the Bay Area's inland areas.
Such a warning means that a prolonged period of "dangerously hot" temperatures will occur, and heat illnesses could arise.
At least two elderly people died in San Jose on Wednesday because of the heat, officials said.
Early in the morning, temperatures were already 5 to 10 degrees warmer than Wednesday.
Drink plenty of water and head for the AC inside these cooling centers located around the Bay Area.
Good news though. The NWS predicts a cooling trend beginning on Friday.
Very hot today with triple digit temperatures fcst for many inland areas. Tomorrow will mark the beginning of a several day cooling trend. pic.twitter.com/mdM01XALAC— NWS Bay Area (@NWSBayArea) June 22, 2017