Authorities said Thursday they expect the rains caused by El Nino, which generates a warming of surface waters in the eastern Pacific Ocean, to continue for another two weeks.
Peruvian President Pedro Pablo Kuczynski asked citizens to remain calm in a series of tweets on Thursday.
Unusually heavy rains have killed at least a dozen people in Peru's latest round of flooding and the muddy waters have begun rushing into homes and streets.
The intense rains and mudslides over the past three days have wrought havoc around the Andean nation and caught residents in Lima, a desert city of 10 million where it nearly never rains, by surprise.
Mobile phone footage from Peru has captured the dramatic moment a woman swept away in a mudslide extricated herself and escaped to safety.
Evangelina Chamorro Diaz, 32, struggled free from a whirlpool of mud on the outskirts of Lima in Peru. They were feeding their pigs when the landslide seized control of them.
Stunned locals watch liquid mud flowing underneath a road bridge can't believe their eyes as the woman suddenly appears out of piles of wooden planks caught in the deluge.
"There's a person there!" an onlooker can be heard on video crying out in Spanish, as the camera zooms in on Díaz.
They both managed to escape with only minor injuries.
News website Peru Reports said extreme weather caused a river in Piura, a city in northwestern Peru, to overflow and collapse drainage systems, leaving 12,000 people homeless and damages spanning 1,200 hectares.
"This emergency will pass, but we must be prudent", he wrote.