The threat level from a bushfire burning out of control in Perth's outer north- east has been downgraded from an emergency warning to a watch and act.
Conditions have improved for firefighters, but there is still a possible threat to lives and homes, the Department of Fire and Emergency Services says.
The warning applies to people in an area bounded by Warbrook Road, east to the Avon River, Wooroloo Brook, south to Connemara Drive East, Campersic Road, Camargue Drive, the Swan River, West Swan Road, Ellen Brook and Railway Parade.
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However, strong winds on Monday afternoon are expected to fan the flames of the fire that earlier came within a couple of metres of some homes around Upper Swan, and a high alert has been issued for the Avon Ridge estate.
Residents are still being told to be ready to actively defend homes or leave.
"The conditions this afternoon are very unfavourable and we're particularly asking residents in the Avon Ridge estate to be on high alert today as we expect a westerly change throughout midday and that will strengthen through to the afternoon," Western Australia's Department of Fire and Emergency Services incident controller Peter Sutton said.
More than 120 firefighters are battling the 210 hectare blaze, which broke containment lines at 2am on Monday.
An evacuation centre has been set up at the Altone Park Leisure Centre.
Grassfire risk as NSW heats up
Searing temperatures have begun blanketing most of NSW, with a stubborn heatwave forecast to persist over the next few days.
While inner and coastal Sydney is headed for a high of 29C on Monday, hot northerly winds are pushing western Sydney and other parts of the state well into the mid 30s, the Bureau of Meteorology says.
Inland NSW will bear the brunt of the scorching conditions, with the heatwave expected to intensify to severe or extreme levels past 45C this week.
Rural Fire Services Commissioner Shane Fitzsimmons has warned high rainfall, combined with hot weather throughout 2016, has caused vegetation to grow longer and dry out.
After warm and windy conditions over recent weeks particularly in the state's west, the landscape is now susceptible to fire, he said on Monday.
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Recent fires have burned through more than 5500 hectares with an estimated $650,000 in crop losses, 300 sheep killed and the destruction of fencing.
Mr Fitzsimmons has urged farmers to protect their properties by putting in firebreaks around paddocks and other valuable assets and warned motorists not to drive through or stop in long grass.
"Even if it's just for a few minutes, as the heat from a car's exhaust can be enough to start a fire," he said.
"Grassfires can move more than three times as fast as a bush fire. Act now, be prepared and survive."
Hot temperatures in western Sydney and the much of inland NSW are expected to spread to the city in coming days, the BoM said.
A southeasterly pushing up the coast on Thursday is expected to bring some relief, with temperatures tipped to fall back briefly before creeping up again on Friday.
Grassfire burning near ACT and NSW border
Firefighters and water bombing helicopters are putting out a grassfire near the ACT-NSW border.
The fire is burning at Nimrod and Oaks Estate roads in the ACT suburb of Beard.
There are 18 fire trucks and two choppers at the fire, which is 300 metres in size and is considered under control.
ACT Fire and Rescue says the blaze is heading in a south easterly direction towards Oaks Estate.
There are no properties under threat.
