Intense Tropical Cyclone Dumazile was a strong tropical cyclone that brought flooding to Madagascar and Réunion in early March 2018. Dumazile originated from an area of low pressure that formed in the South-West Indian Ocean near Agaléga on 27 February. The system concentrated into a tropical disturbance on 2 March and was named the next day, as it intensified into a tropical storm. Amid conditions conducive for intensification, Dumazile strengthened over the next two days and reached peak intensity on 5 March as an intense tropical cyclone, with 10-minute sustained winds of 165 km/h (105 mph), 1-minute sustained winds of 205 km/h (125 mph), and a central pressure of 945 hPa (27.91 inHg). The system weakened steadily over the next couple days because of increasing wind shear as it tracked to the southeast. Dumazile became post-tropical on 7 March and eventually dissipated completely on 10 March near the Kerguelen Islands.

Intense Tropical Cyclone Berguitta was a strong tropical cyclone that caused flooding in Mauritius and Réunion in January 2018. The third tropical system and first intense tropical cyclone of the 2017–18 South-West Indian Ocean cyclone season, Berguitta originated from an area of scattered thunderstorms southwest of the Chagos Archipelago on 10 January. It slowly organised as it moved southwards, and became a tropical storm as it turned west on 13 January. Berguitta then rapidly intensified to achieve its peak intensity on 15 January while stalling north of Rodrigues. At the time, the cyclone possessed 10-minute sustained winds of 165 km/h (105 mph), 1-minute sustained winds of 195 km/h (120 mph), and a minimum central pressure of 960 hPa (28.35 inHg). Berguitta weakened as it moved slowly west-southwestwards on 16 January, and the cyclone degraded to a tropical storm by 17 January. It accelerated southwestwards over Mauritius and Réunion on 18 January, before degenerating to a post-tropical cyclone the next day. The remnants of Berguitta transitioned into an extratropical cyclone and dissipated over the Indian Ocean on 24 January.