Koh Samui residents warned of flash floods as heavy rain and high tides raise risks

SURAT THANI — 12 November 2026, Thailand’s Department of Disaster Prevention and Mitigation (DDPM) issued an urgent flood warning for Koh Samui on 12 November 2026, urging residents in vulnerable areas to move their belongings to higher ground as heavy rain and high tides increase the risk of flash floods, landslides and flooding.

The department said heavy rain had been reported across Koh Samui district in Surat Thani province, with rainfall continuing. Combined with high sea levels, the conditions could trigger flash floods, rapid runoff from mountainous areas, landslides and flooding in low-lying communities.

Residents in flood-prone areas, particularly low-lying neighbourhoods and communities near hillsides, have been advised to move valuables and essential belongings to higher ground.

Authorities also urged residents to take precautions against electric shocks, assist vulnerable people and closely monitor official weather and emergency announcements.

Emergency alerts sent to mobile phones

The DDPM said it had coordinated with mobile network operators AIS, True and NT to send emergency flood warnings to people in Koh Samui through the Cell Broadcast system.

Residents requiring assistance can contact their district chief, subdistrict headman, village headman, local administrative officials or community leaders.

Emergency reports and requests for assistance can also be made through the DDPM’s official LINE account, @1784DDPM, or by calling its 1784 emergency hotline, available 24 hours a day.

Authorities urged residents to remain alert as heavy rainfall continues and high tides increase the risk of flooding.