Heavy rainfall caused water accumulations on Koh Samui from early afternoon, triggering an official alert followed by a gradual improvement in traffic by the end of the day.
From early afternoon, water began to accumulate on several roads across Koh Samui due to heavy rain. Low-lying areas and roads along waterways were quickly affected.
Around 4:41pm, the Department of Disaster Prevention and Mitigation (DDPM) issued an official alert for the districts of Koh Samui and Koh Phangan. Authorities warned of risks of flash floods, mountain torrents, mudflows, landslides and standing water. They also advised to store belongings at height, watch out for electrocution and protect vulnerable people, while urging residents to call the emergency number 1784 if needed.
By 6:40pm, conditions began to improve in some areas. Traffic had returned to normal in front of Wat Plai Laem, where rain had become light with no water accumulation. The stretch from Rajabhat to the Mercury junction and the old boxing stadium was also passable as usual. At the Lamai Sansee junction, vehicles could still circulate.
Several spots remained problematic. On the road to Dao market and the Rajabhat road, small vehicles were advised to avoid the area. At the City junction, in front of the Caltex petrol station, small cars could no longer pass. In front of Wat Plai Laem, all types of vehicles were blocked and a diversion via Plai Laem police station and the Thong Sai junction was recommended.
Local authorities continued to urge residents to report any new flooding points and road conditions to keep information updated in real time.
Sources : Local Alert, DDPM