The Mozambican authorities say at least 1.6 million people could be affected in the current rainy season.
They are likely to victims of strong winds, floods, cyclones and even earthquakes, according to the government relief agency, the National Disasters Management Institute (INGC).
Luisa Meque, who heads the agency, said they have drawn a contingency plan - with a budget of $99m (£78m) - which will be submitted to the cabinet for approval.
She said the government had already secured almost $11m for the implementation of some actions in the contingency plan.
Prime Minister Carlos Agostinho do Rosário appealed to government agencies to be prepared to offer assistance to people who will be in need.