Water in the Mae Sai river is forecast to rise back to bank level around 08.00 on 2 August 2026, though not overflow, after heavy rain in Myanmar and 133–163 mm on the Thai side. Water may seep through embankments into riverside areas such as Ban Hua Fai, Sai Lom Joy and Koh Sai, and drainage will be slow. The Office of National Water Resources warns of flash floods and landslides in many provinces on 2–4 August, with heavier rain expected 3–7 August. For shops, stock and vehicles in low riverside areas of Mae Sai, move goods to higher ground now and check routes and supply deliveries.