The figures announced on Wednesday reflect a doubling of case numbers overnight and by far the most local infections WA has recorded during the pandemic.
All but two of the new cases were locally acquired.
The number of people in hospital has increased to four but none are in intensive care, continuing a streak of low hospitalisations.
More than 98 per cent of eligible West Australians have received at least one vaccine dose and the third-dose rate is expected to hit 70 per cent by next week.
Premier Mark McGowan said he was hopeful the state would not need to move to "level two" restrictions including stricter venue density limits and a requirement for students as young as year three to wear face masks.
"The climb in caseload has been far slower than the eastern states and that has been a good thing for us. Obviously it is starting to grow pretty rapidly now," he told reporters.
"Other states have been through months and months and months of extreme restrictions that we haven't been through. I'm very keen to, if we can, ameliorate or avoid some of those things. The key to that is high vaccination rates and hopefully low hospitalisation rates."
An outbreak in the remote Aboriginal community of Mantamaru has grown to six infections after two police officers tested positive.
The community, which is home to about 50 people, remains in lockdown.
New restrictions came into effect into WA this week, including density limits at hospitality venues and a state-wide requirement to wear face masks at public indoor venues.
They are on top of existing proof-of-vaccination rules which apply to virtually all hospitality venues, gyms and entertainment venues.
But the premier clarified on Wednesday that up to 200 people could attend outdoor events at homes such as backyard weddings.
Indoor home gatherings remain capped at 30 people.
The health department's modelling suggests WA will have 463,932 new symptomatic cases and 129 deaths in the next six months, with 715 people admitted to ICU.
It indicates the outbreak will peak between April and May at around 10,000 daily cases before dropping off significantly during the winter months.
WA's March 3 border reopening will have "little or no effect" on the outbreak, adding just 13 daily cases.
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