An Egyptian cargo plane carrying food, medical assistance and tents for shelter arrived on Wednesday in Malawi's capital of Lilongwe.
About 1.85 million people have now been affected by Cyclone Idai and its aftermath in Mozambique alone, U.N. humanitarian agency OCHA said on Tuesday.
The number of people in makeshift camps after a powerful cyclone in Mozambique has risen by 18,000 to 128,000 but the death toll remains roughly unchanged at 447.
Authorities in India's eastern state of Odisha evacuated 300,000 people, suspended operations at a major port and cancelled many trains and flights on Wednesday.
Cyclone Ockhi barrelled into the Lakshwadeep islands in southwestern India on Saturday after drenching the neighboring states of Kerala and Tamil Nadu.