The fourth cyclone to hit Madagascar in a month has damaged houses and crops, and raised fears of fresh floods.
A senior official from Red Cross Denis Bariyanga says, about 160,000 households have been affected by the severe weather.
Cyclone Emnati made landfall late on Tuesday night, bringing winds and heavy rain.
More than 30,000 people were evacuated from the country’s south-eastern coast before the storm hit.
Red Cross says there is a pressing need to find food, clean water and bedding for the people who have been displaced.
Madagascar is prone to seasonal cyclones between November and April every year.