The Pfizer vaccine is now available to all West Australians aged over 12.

"Pfizer is being increasingly supplied - we are getting about 20,00 doses a week into the state, we are relying on the Commonwealth to make it available and that availability is increasing," Western Australia Vaccine Commander Chris Dawson said.

There are currently about 50,000 vaccine appointments available across state-run clinics over the next six weeks and some of those clinics will be allowing school walk-ins from next week.

School students and staff in Western Australia will be able to get the coronavirus vaccine without a booking at designated centres from next week.

Education Minister Sue Ellery said designated after school time slots at community vaccination centres for 16-17-year-olds, as well as school-based staff, will begin from Monday.

Ms Ellery also confirmed 12-year-old students and school staff will be able to walk-in without a booking beginning in Term 4.

Mr Dawson said the designated vaccination sites will be able to accommodate the influx of student and school staff walk-ins.

"We will have additional vaccine supplies and staff on hand to accommodate the extra walk-ins from next week," he said.

Mr Dawson said from today, residential aged care facility workers will be required to have had at least one dose of the coronavirus vaccine in order to continue working.

Ms Ellery said there are no plans for the coronavirus vaccine to be mandatory for teachers and school staff at this stage, but encouraged as many as possible to take advantage of the walk-in offer from next week.

"I know 60 per cent of teachers in WA are aged over 40 and eligible to get the vaccine," Ms Ellery said.

"I encourage everyone to get vaccinated as soon as possible."

Ms Ellery said 16 to 17-year-olds have been prioritised over younger students due to the shorter amount of time they have left before leaving school.

"In my job I speak with a lot of 16-17-year-olds and I can tell you a lot of them are very interested in getting vaccinated," she said.