Persistent heavy rainfall and Cyclone Senyar triggered flooding that affected millions in Thailand, Malaysia, and Indonesia, causing widespread damage and disruption, according to Aon in its latest "Weekly Cat Report".
The report, dated 28 November 2025, giving an estimate of the financial loss involved, stated, “Given the combined effects of the monsoon, convection, and cyclone, attributing damage specifically to flooding remains challenging. According to private investment companies, total economic damage in Thailand is estimated at $360–740m, with $16m in Hat Yai alone.
“Local and national governments responded by dispatching emergency budgets; for example, Ayutthaya received nearly $1m. In Malaysia and Indonesia, the economic toll is expected to be lower, though likely in the upper tens of millions of US dollars, given the extent of the event.”
Commenting on the situation in each of the countries, the report stated:
Thailand
Based on several situation reports issued by Thailand’s Department of Disaster Prevention and Mitigation, a total of 21 provinces reported flooding, with 52 districts affected at peak in the central and northern regions and up to 117 districts in the south. At the height of the event, nearly 1.1m households (2.9m people) were affected in the south alone, while approximately 143,000 households and nearly 500,000 people were impacted in central and northern provinces.
The highest number of affected properties (though the level of flood-related damage is unsure) was reported in provinces Ayutthaya (68,000), Songkhla (370,000), Nakhon Si Thammarat (223,000), Phatthalung (188,000), and Narathiwat (82,000). Further impacts included extensive damage to infrastructure, such as cut-off bridges and damaged roads.
The total death toll so far is 53 people: 28 in northern Thailand and 25 in the southern provinces, most of which were recorded after Tropical Storm Senyar began to play a key role.
Malaysia
Although flooding was not as severe as in neighbouring Thailand, the event affected 10 states across Malaysia, displacing more than 21,000 people nationwide. Kelantan was the worst impacted, with 9,642 evacuees, followed by Perak (4,300), Selangor (2,900), and Kedah (2,800). The event has disrupted transportation and overwhelmed flood mitigation systems, particularly in Selangor. The approximate number of casualties is one person so far.
Indonesia
According to reports issued by the National Board for Disaster Management (BNPB), Aceh province reported over 2,400 homes damaged, with significant additional impacts to roads and farmland. In West Sumatra, Padang Pariaman saw 3,000 homes inundated, while Agam Regency experienced damage to 21 homes. North Sumatra was affected by flooding in Central Tapanuli, with 1,902 houses impacted, and North Tapanuli reported 50 houses damaged. Central Java’s Kebumen had floodwater threatening 2,200 homes, and East Java’s Pasuruan suffered widespread residential flooding.
Given the early nature of the information from source media, the exact extent of damage cannot yet be determined. In terms of the death toll. Statistics vary widely, as rescue operations are still ongoing, but early estimates report 47 casualties.