The Thai Meteorological Department warns of heavy to very heavy rain in the South and East during 18-20 October 2026, then more rain across Bangkok, its vicinity, central Thailand and the upper South during 21-25 October, with gusty winds in some areas. Flash floods and runoff are possible. For a business: move deliveries and outdoor work earlier, protect stock and equipment on low ground, and expect slower transport and possible flooding in Bangkok and central areas in the week of 21 October. Sea waves above 2 metres are forecast where storms occur, so check boat and fishing schedules.