At least three fires that have prompted emergency warnings and evacuations since Friday are continuing to burn out of control, with thousands of hectares being burned.
Two of the fires are stationary but uncontained, while firefighters are chasing another that is moving quickly as they seek to contain it.
An emergency warning is in place for Bilbarin, Babakin, Corrigin and Shackleton about 200 kilometres east of Perth, with residents warned it is too late to leave.
Those in surrounding areas have been told to get out now if they can, or else make their final preparations to actively defend their property by monitoring for spot fires.
The bushfire burning near the Bruce Rock shire was moving southwest quickly about 4.30pm on Sunday local time, burning out of control and unpredictably.
About 140 firefighters are battling the blaze, working to strengthen containment lines in a bid to bring the fire under control.
In Hester, 100 or so residents were warned it was too late to flee homes and they were urged to take shelter inside on Saturday evening.
About 2.45pm on Sunday the town of Hester was no longer under direct threat, but was still in an emergency area as the uncontained but stationary fire burned out of control.
An emergency warning had already been issued for the South West region, including Hester, Hester Brook, Bridgetown, Greenbushes, Catterick, and Kangaroo Gully in the Shire of Bridgetown-Greenbushes.
"You are in danger and need to act immediately to survive. There is a threat to lives and homes," it said.
Emergency WA says 150 firefighters are battling the blaze with firefighters actively protecting properties from the fire that has burned about 2200 hectares already.
Aerial support has been sent to assist ground crews and police. SES officers and ambulance personnel are also in attendance.
The Bridgetown Hospital emergency department has reopened.
An emergency warning remains for the coastal shire of Denmark, after residents were told to evacuate on Friday.
People in Shadforth and Scottsdale have been told to leave and seek safety if the way is clear, with westerly winds expected to increase on Sunday afternoon.
Firefighters are working to consolidate boundaries around the fire, with 190 firefighters in attendance.
The fire has burned through about 2150 hectares and there have been "unconfirmed reports of property damage and loss" from the fire, EmergencyWA says.
WA Premier Mark McGowan on Saturday said multiple areas in the state continued to face "dangerous bushfire conditions with more hot weather forecast today and tomorrow".
The premier thanked firefighters for their efforts over the week and urged the public to follow advice from Emergency WA.
Four specialists from NSW Fire and Rescue are on there way to WA on Sunday afternoon to assist local authorities battling the out-of-control fires, along with members of the Rural Fire Service, the National Parks and Wildlife Service and Forestry Corporation, following a request from WA's Fire and Emergency Services department.
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