BANGKOK — 29 June 2026, Thailand’s Meteorological Department has issued its sixth weather warning, forecasting heavy to very heavy rain across parts of the country from 29 June to 3 July 2026, while warning of rough seas in the upper Andaman Sea.
The warning, announced at 05:00 on 29 June 2026, said rainfall is expected to increase nationwide during the period, with the heaviest downpours likely in the eastern region and the west coast of the South.
The department attributed the weather to a monsoon trough stretching across the North and upper Northeast, combined with a strengthening southwest monsoon covering the Andaman Sea, Thailand and the Gulf of Thailand.
Residents in affected areas are advised to remain alert for flash floods, forest runoff and accumulated rainfall, particularly in foothill communities, areas near waterways and low-lying locations.
The department also warned of strong winds and rough seas in the upper Andaman Sea between 29 June and 3 July, with waves of 2-3 meters, rising above 3 meters during thunderstorms.
In the lower Andaman Sea and the upper Gulf of Thailand, waves are expected to reach around 2 meters, exceeding 2 meters in thundershower areas.
The Meteorological Department urged all vessels in the Andaman Sea and the Gulf of Thailand to navigate with caution and avoid sailing through thunderstorm areas. Small boats in the upper Andaman Sea are advised to remain ashore during the warning period.
The agency also urged the public to plan travel carefully and monitor the latest weather updates through the Meteorological Department’s website or its 24-hour information services.
The next weather bulletin is scheduled to be issued at 17:00 on 29 June 2026.