Meteorological Department bulletin No. 8 checks the list of provinces to prepare for. "Heavy to very heavy rain." The upper Andaman Sea will have strong winds and waves, impacting the area until 3 July 2026, with close monitoring for flash floods and rapid mountain runoff.
On 30 June 2026, the websiteof the Meteorological Departmentissued a warning about heavy to very heavy rain across Thailand and strong winds with waves in the upper Andaman Sea, bulletin No. 8. It states that from 30 June to 3 July 2026, Thailand will experience heavy to very heavy rain in some areas, especially in the eastern region and the western side of the southern region. This is due to a monsoon trough passing through the north and upper northeast, combined with a strengthening southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand. Residents in these areas should be cautious of dangers from heavy to very heavy rain and accumulated rainfall, which may cause flash floods and rapid mountain runoff, particularly in foothill areas near waterways and lowlands.
Regarding waves in the upper Andaman Sea, they will be quite strong from 30 June to 3 July 2026, with wave heights of 2-3 meters, and over 3 meters in areas with thunderstorms. The lower Andaman Sea and the upper Gulf of Thailand will have waves about 2 meters high, with waves exceeding 2 meters in stormy areas. Mariners in the Andaman Sea and the Gulf of Thailand should navigate cautiously and avoid sailing in stormy conditions. Small boats in the upper Andaman Sea should refrain from leaving shore during this period.
For safety and to minimize potential impacts, the public is advised to plan their activities and travel cautiously during this time. They should follow announcements from the Meteorological Department and monitor information on the department's website.http://www.tmd.go.thor call 0-2399-4012-13 and 1182, available 24 hours.
30 June 2026
2 July 2026
3 July 2026
