The San Joaquin County Offices of Emergency Services and Public Health have opened cooling centers throughout the county.
Five county community centers and Stockton's Civic Auditorium will provide cooling for people who need it.
Emergency Services Coordinator John Austin says high temperatures will likely keep the cooling centers open through Friday.
"They will be supplied with water, ice, and it's just a place that will be cool if they don't otherwise have that in their homes," says Austin.
Stockton's Oak Park Senior Center is not an official cooling center but it has extended its hours because of the heat.
Peter Slater, 71, and says seniors like him in particular need relief from the heat.
"It's human nature they want to stay cool, they get heatstroke, get oversweated, get dizzy, get medication, people on medication too, the sun affects them," says Slater.
Cooling centers have also opened up in Tracy and Manteca.