Stay inside in an air-conditioned building, drink plenty of water, and know the signs of heat illness, says Contra Costa Health Services. See health tips about heat.
Call 911, if you or someone near you is having a health emergency.
Call 211 or contact your city for information on cooling centers.
See tips and a list of Places for Seniors and People with Disabilities to Cool Off (PDF).
Other options include shopping malls, movie theaters, museums, and libraries with air conditioning.