Officials in Mozambique say nearly 70 people have been killed in floods in central and northern regions.
More than 140,000 people are affected, with thousands of homes destroyed.
Crops and livestock have been lost.
The floods have also affected neighbouring Malawi, where nearly 60 people have died and close to a quarter of a million made homeless.
The Malawian authorities have ordered all people living in flood-prone areas to move from their homes to temporary accommodation areas on higher ground.
More floods are predicted with the expected arrival of a cyclone on Thursday.