Torrential rains from September 9 to 10, 2025, have caused catastrophic flash floods across Indonesia's Bali and Flores islands, resulting in at least 20 confirmed fatalities. A significant number of individuals remain unaccounted for as the National Disaster Mitigation Agency (BNPB) coordinates extensive rescue and relief operations.
In Bali, the capital city of Denpasar experienced severe flooding and the collapse of two buildings, leading to four deaths. The Jembrana region reported two fatalities and necessitated the evacuation of 85 residents due to inundated homes. Access to Bali's international airport near Denpasar was severely disrupted, with roads passable only by heavy-duty vehicles.
Flores Island, part of the East Nusa Tenggara province, suffered immense devastation in the Nagekeo district. Four lives were lost, and four people are still missing. The floods swept away villagers and vehicles, destroyed vital infrastructure including two bridges, and caused widespread damage to government offices, plantations, and agricultural lands. The challenging terrain of Flores, combined with severe weather, complicated immediate rescue operations.
Over 600 personnel, including police, soldiers, and rescue teams, are actively engaged in assisting affected populations. In Bali, more than 500 individuals have been relocated to temporary shelters such as schools and mosques. On Flores, 256 displaced residents are taking refuge at the Nelemawangi Village hall.
The floods have inflicted substantial damage on critical infrastructure across both islands. Major roadways in Bali, including those leading to the international airport, were blocked by debris and floodwaters. On Flores, 18 villages faced disruptions to essential services like road and phone communications.
While Indonesia's monsoon season typically runs from November to April, bringing with it the usual risks of landslides and floods, climate change is increasingly recognized as a significant factor influencing storm patterns. This phenomenon contributes to heightened rainfall intensity and a greater frequency of flash flooding events across the archipelago. Indonesia's geography, with over 17,000 islands and an extensive coastline, makes it particularly vulnerable to rising sea levels and extreme weather events, with projections indicating a continued rise in temperatures and an increase in the intensity of extreme weather.