Major roads are closed near Perth's CBD and people have been warned to avoid Kings Park as firefighters continue to battle a bushfire in the popular parkland.
There was a smoke haze over parts of Perth due to the blaze and Kings Park has been shut.
The fire started on the west side of the park at about 1am on Tuesday, sparking the haze over roads and homes in the nearby affluent western suburbs.
The fire, which is believed to have been deliberately lit, has burnt about 40 hectares and 80 firefighters are on the scene.
Motorists have been advised to avoid the area.
Two other major bushfires are threatening lives and homes in WA's south.
A watch and act, the second-highest warning level, is in place for residents around Gidgegannup near the Perth Hills after a fire broke out overnight.
The warning was downgraded from an emergency.
About 60 firefighters are still battling the fire, which has been contained but is still burning out of control and poses a threat to lives and homes.
A watch and act is also in place in WA's south-west where a fire is threatening homes in the Augusta township area.
The bushfire began near the Westbay Retreat Caravan Park and Augusta-Margaret River Shire chief bushfire control officer Dave Holland said firefighters had saved multiple homes.
"We've managed to keep it away from a number of houses," he told ABC radio.
"As far as I'm aware (those from the caravan park) are all safe."