In the Southern Hemisphere, there were two tropical cyclones that formed in late December and persisted into January 2021 – the remnants of Tropical Storm Chalane over southern Africa, and a tropical depression east of Madagascar that would soon become Tropical Storm Danilo. In April, Cyclone Seroja produced deadly flooding in Indonesia and East Timor, killing at least 272 people. Also in the month, Typhoon Surigae in the northwest Pacific Ocean became the strongest Northern Hemisphere tropical cyclone to form before the month of May; it attained 10-minute maximum sustained winds of , according to the Japan Meteorological Agency, or one-minute sustained wind of according to the Joint Typhoon Warning Center. In May, the Eastern Pacific basin had its earliest tropical storm on record, with Tropical Storm Andres. Also in May, Cyclone Tauktae tied a cyclone in 1998 to become the strongest cyclone to strike Gujarat, with sustained winds of ; Tauktae killed at least 118 people in India, with another 66 deaths after Barge P305 sank near Heera oil field, off the coast of Mumbai. In August, Hurricane Ida struck the U.S. state of Louisiana with sustained winds of , tying 2020's Hurricane Laura and the 1856 Last Island hurricane as the strongest on record to hit the state. Throughout the United States, damage from Ida was estimated at US$64.5 billion. In December, Typhoon Rai struck the eastern Philippines, which killed 410 people.
