And the state's power grid manager said spiking electricity use could force it to declare another "stage one emergency." Saturday's warning expired Saturday night.
The National Weather Service said an excessive heat warning is in effect for much of southern California, including Los Angeles and San Diego.
Downtown Los Angeles could see highs of 101 degrees, though the humidity will make it feel like 115. San Diego is expected to reach 91 degrees.
Slightly cooler temperatures are forecast for San Francisco, dipping as low as 81 degrees near the ocean. But the East Bay and South Bay are expected to swelter again. Temperatures in Livermore could hit 111. Morgan Hill south of San Jose could peak at 112.
But some relief could be on the way. The National Weather Service is forecasting a gradual cool-down throughout the week.
