A bushfire north of Perth is set to hit a residential community amid warnings that lives are at risk if anyone stays in the area.

The Ocean Farms Estate and nearby Seaview Park are at most risk of the fire, which has destroyed more than 9000 hectares since Saturday.

About 200 firefighters are on the scene with support from water-bombing aircraft.

But early on Wednesday, Emergency WA said homes and properties in Ocean Farms Estate would be impacted “imminently”.

It said anyone still planning to leave should use Indian Ocean Drive and head south.

“Your life may be in danger if you stay,” the warning said.

Other communities in the area have been told to heed the latest advice and take the appropriate action with an emergency warning message still in place.

A watch and act warning remains for a fire at Mundaring, east of Perth, with that blaze contained but not controlled.

About 25 firefighters remain on the scene.

However, concerns have eased for a fire at Geraldton, north of Perth, with only a bushfire advice now in place and the fire both contained and controlled.

On Tuesday, incident controller Andy Duckworth said the blaze threatening homes at Ocean Farms Estate was running at 3.5km/h.

Conditions were challenging at times, with high temperatures and strong, shifting winds across the fire ground.

The fire perimeter has stretched to 50 kilometres with 200 firefighters on the ground supported by up to 13 aircraft, including a large air tanker.

Mr Duckworth said there were particular concerns for people living in the mainland community of Wedge Island with authorities unable to send ground crews into the area because of the presence of unexploded ordinance from an old bombing range.

“There’s a lot of bush around there, and we’re limited in our ability to fight the fire. We can use our aircraft but not much else,” he said.

“So we’re not confident we can pull it up before it reaches Wedge Island by any means.”

Tuesday’s emergency followed an easing of the danger on Monday after a string of fires threatened various areas to the north and south of Perth, on the state’s southwest coast and in the Goldfields.

With very hot weather forecast until at least Sunday, Department of Fire and Emergency Services Deputy Commissioner Craig Waters said the risk of more fires was high.

“Whenever you come into a period of really hot weather coupled with extremely high easterly winds, we’re always going to be in for a world of hurt,” he said.

-AAP