Deadly heavy rainfall in southern Thailand, Peninsular Malaysia and Indonesia’s Sumatra

TS Senyar floods

Since mid-November, seasonal monsoon rains and Tropical Storm (TS) Senyar have triggered widespread floods and landslides across parts of southern Thailand, Peninsular Malaysia and Indonesia’s Sumatra region. The impact has been particularly devastating on Indonesia: at least 753 people have been killed and 2,600 others injured. 570,000 people have been displaced across Aceh, North Sumatra and West Sumatra provinces

In southern Thailand, which has been impacted by seasonal heavy rainfall, at least 145 people have been killed. A state of emergency was declared in Songkhla, which alone recorded 104 fatalities. One of the worst-hit areas within the province was Hat Yai, where many tourists were stranded in partially submerged buildings.

In neighbouring Peninsular Malaysia, at least one person was killed in Kelantan state. Two others died in Perlis state due to the impact of the monsoons and TS Senyar in late November. 

At least 13,662 people remained at relief centres across the states of Perak, Selangor, Perlis, Terengganu, Kelantan, Pahang, Kedah and Negeri Sembilan.

What to Expect:

Further seasonal heavy rainfall is possible over southern Thailand until the end of December and is likely over Peninsular Malaysia and Indonesia’s Sumatra region through January 2026.

 

Travel

Impact on Travel:

Across the three countries, utilities like water, electricity and communications services were significantly disrupted. Roads and other infrastructure suffered major damage.

Floods and landslides have severely disrupted rescue and relief efforts in the affected areas, where dozens of roads were impassable. Disruptions to public transportation are likely. Thai AirAsia, Thai Lion Air and Thai VietJet Air, among other airlines, cancelled or suspended many flights to Hat Yai International Airport (HDY/VTSS) in Songkhla Province, Thailand, through 30 November. Most airlines have since resumed operations with reduced capacities.    

Advice:

  • Confirm the viability of overland travel routes before departure.
  • Do not attempt to cross floodwaters.
  • Immediately evacuate vehicles to higher ground if caught in rising water.
  • Remain alert for landslide warning signs, including cracks or bulges in the soil, or the faint rumbling sounds of an approaching debris flow.
  • Use flashlights during a prolonged power outage, as candles can cause fires.
  • Turn off or disconnect appliances and other equipment in case of a momentary power surge.
  • Exercise caution when purchasing and consuming refrigerated goods during power outages, as these may become contaminated.
  • Implement enhanced personal hygiene and water sanitation practices. Seek medical assistance if you develop symptoms of acute diarrhoea.
  • To minimise the risk of contracting mosquito-borne diseases, take measures to prevent mosquito bites and use insect repellents at all times.

Disclaimer

This is a summary of our Advisories. The full version provides a detailed analysis, additional insights and the context for each incident. You can view a sample here.

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Destinations Impacted 

Thailand, Malaysia and Indonesia

Extreme risk destinations: Aceh, North Sumatra and West Sumatra.

High risk destination: Songkhla Province

Medium risk destinations: Kedah; Kelantan; Nakhon Si Thammarat Province; Narathiwat Province; Negeri Sembilan; Pahang; Pattani Province; Perak; Perlis; Phatthalung Province; Satun Province; Selangor; Surat Thani Province; Terengganu; Trang Province; Yala Province

Risk Levels

Safe, with few security risks. Travel disruptions: travel is possible with an expectation of routine disruptions and delays.

Generally safe, with some predictable security risks. Travel disruptions: travel is possible with an expectation of routine disruptions and delays.
Not completely safe, but typically presents predictable security risks. Travel disruptions: travel is possible, but there is a potential for disruptions.
Can be dangerous and may present unexpected security risks. Travel disruptions: travel is possible, but there is a potential for severe or widespread disruptions.
Extremely dangerous and presents unpredictable security risks. Travel disruptions: chaotic; travel impossible.

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