The National Water Resources Office (สทนช.) has added flood, flash-flood, flood-torrent and landslide watch areas for 11-13 September 2026 (Notice No. 3/2569). Added areas include Chon Buri (Si Racha), Ratchaburi (Suan Phueng), Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phuket, Trang, Songkhla and Satun, plus parts of Bangkok's surroundings in the rain forecast. Rain is expected to continue 14-16 September in Bangkok and its vicinity, the central, eastern and southern regions. If you run a business or premises in these districts, check stock elevation, vehicle and delivery routes, and staff safety plans now.