British charity Christian Aid says the disasters displaced millions and caused widespread deaths - seven of them caused damage of more than $10 billion.
Towns east of Tokyo that were still recovering from damage caused by Typhoon Hagibis earlier this month were hit by torrential rain that caused dangerous flooding and mudslides.
More than 100,000 rescuers, including 31,000 troops, were working into the night to reach people trapped after torrential rain caused landslides and filled rivers until they burst their banks.
Rugby World Cup matches, concerts and other events have been cancelled. Flights were grounded and train services halted.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2020 TRT World.