HARARE, Zimbabwe — The death toll from a huge cyclone that hit Malawi, Mozambique and Zimbabwe last week stood at 150 on Sunday, with hundreds more missing and tens of thousands of others stranded and cut off from roads and telephones in mainly poor, rural areas, officials said.

The cyclone, called Idai, has affected more than 1.5 million people in the three southern African countries, according to the United Nations and government officials.

The port city of Beira in Mozambique was hit the hardest, with the airport closed, electricity cut and many homes destroyed. The storm hit Beira late Thursday and moved west into Zimbabwe and Malawi, affecting thousands more, particularly in areas bordering Mozambique.

Homes, schools, businesses, hospitals and police stations have been destroyed by the cyclone. Thousands of people who were marooned by the heavy flooding abandoned their possessions to seek safety on higher ground.