The Foreign Office has warned British travellers to leave parts of Mozambique which look set to be hit by torrential rain and winds of up to 150mph.
Floods in Mozambique have forced tens of thousands from their homes
The Bazaruto Archipelago and low lying coastal areas are expected to be the worst hit by Tropical Cyclone Favio.
The Foreign Office advises against any travel to the Archipelago, which is off the coast of the African country, and Britons on the islands should leave.
Floods last month have forced 90,000 people from their homes in Mozambique.
It has left 37,000 living in flimsy tented camps.
Mozambique, which is in south east Africa, is bracing itself for the cyclone, which is set to come after four provinces in the country were hit by the floods.
The Foreign Office has also advised against embarking on all but essential travel to low-lying coastal areas between the towns of Quelimane and Inhambane.
The advice on the Foreign Office's website states that Britons who remain in the coastal areas between these two towns should seek shelter on higher ground and follow local advice.
"Wind gusts could exceed 130 knots (150mph/240kph). Low-lying coastal areas may be affected by surging waves," said the Foreign Office.
It continued: "There is a risk of structural damage to buildings."
People have been warned not to climb trees and to leave flimsy housing due to the risk of collapse.
The Red Cross and army remain on standby ahead of the expected severe weather.