Marin County opened cooling centers throughout the community on Saturday.
The use of face coverings and physical distancing will be required, according to the county.
Santa Clara County has also opened cooling centers in accordance with Centers for Disease Control and Prevention guidance on how to do so safely during the coronavirus pandemic.
Residents can cool off at centers in San Jose, Cupertino, Mountain View, Campbell, Milpitas, Santa Clara, Saratoga, Morgan Hill and Gilroy.
To help with the search for heat relief, PG&E has published “Find a Cooling Center Location.”
The NWS’s excessive heat warnings are expected to continue into next week.