BANGKOK, Thailand – Thai meteorological authorities have issued their sixth severe weather warning in rapid succession, signalling significant disruptive conditions expected across the nation. Between June 29 and July 3, 2026, the country is forecast to experience heavy to very heavy rainfall, with the potential for localized flash floods. Concurrently, the agency has cautioned of rough seas in the Andaman Sea and the Gulf of Thailand.
Monsoon Trough and Southwest Monsoon Bringing Moisture
The weather pattern is shifting due to a monsoon trough extending from the north to the upper northeast of the country. Simultaneously, the southwest monsoon is noticeably intensifying over the Andaman Sea and the Gulf of Thailand. This powerful combination is drawing thick rain clouds across the nation. The agency anticipates the most substantial rainfall in the eastern region and along the western coast of the southern provinces.
Flash Floods and Runoff in at-Risk Areas
Sloping terrain, settlements located along waterways, and low-lying zones are identified as particularly vulnerable. Meteorologists are predicting rapidly swelling streams and the accumulation of large water masses. The Thai Meteorological Department has urged residents in affected provinces to heed warning signals and not underestimate overflowing ditches. Travelers are advised to plan their routes carefully, taking the current warning situation into account.
Upper Andaman Sea Becomes a Rough Zone
Waves measuring two to three meters are expected to develop off the upper Andaman Sea. During thunderstorms, breakers can surge to over three meters. The lower Andaman Sea and the upper Gulf of Thailand will also experience wave heights of approximately two meters. The agency has cautioned vessels to consistently avoid storm cells.
Small Boats Must Remain Ashore
A strict order for small boats in the upper Andaman Sea mandates them to remain docked during the warning period. The department will not permit any exceptions. Those venturing near the coast should closely follow the latest weather bulletins. The Meteorological Department provides continuous updates via its website and 24-hour service.
Next Bulletin This Afternoon
The Meteorological Department announced the next official update for Monday, June 29, at 5:00 PM. The current warning status will remain in effect until then. The issuance of a sixth warning within this timeframe highlights the significant and dynamic pressure exerted by the monsoon trough and monsoon on the kingdom currently.