National protests have persisted calling for the removal of Manuel Merino, after parliament ousted relatively popular President Martin Vizcarra last week.
Merino stepped down shortly after a congressional session called on him to resign after two people were killed in protests against his appointment.
“I want to let the whole country know that I’m resigning,” he said in a televised address.
Congress was expected to name another president the third this week on Sunday evening.
Elections are scheduled for April 2021.
Thousands of people have taken to the streets since Merinos appointment. The Health Ministry said two people were killed Saturday in a large, peaceful march that was met with shotgun pellets and tear gas from police.
Congress voted overwhelmingly to oust Vizcarra last week, citing his mishandling of the coronavirus pandemic.
Peru president said he will not challenge lawmakers decision to remove him from office
The legislators initially sought to impeach Vizcarra on an allegation he received more than $630,000 in kickbacks for construction projects while serving as governor in southern Peru from 2011-2014. He denies the allegations.