Weather Bulletin No. 8: Check the list of provinces at risk "Heavy to very heavy rain" Warning for September 11-13: A strong low-pressure area in the central South China Sea is likely to intensify into a tropical cyclone, expected to move near the coast of Vietnam on September 13-14.
On September 10, 2026, the websiteMeteorological Departmentissued Weather Bulletin No. 8 regarding heavy to very heavy rain across Thailand, stating that on September 10, 2026, the northern, northeastern, central regions, including Bangkok and its vicinity, eastern and southern regions will experience heavy to very heavy rain in some areas.
This is due to a high-pressure area or cold air mass covering the upper northern and northeastern regions, causing the monsoon trough to shift down across the lower northern, upper central, and lower northeastern regions into a strong low-pressure area in the central South China Sea. Additionally, a moderate-strength southwest monsoon covers the Andaman Sea, southern, central, eastern regions, and the Gulf of Thailand.
From September 11-13, 2026, rainfall will increase in the south with heavy to very heavy rain in some areas. Meanwhile, rain will decrease in the north and northeast. The central region, including Bangkok and its vicinity and the east, will experience heavy rain in some places. This results from a high-pressure area or cold air mass from southern China extending over the north and upper northeast, causing the monsoon trough to move down across lower central, upper Gulf of Thailand, eastern, and lower northeastern regions into the strong low-pressure area in the central South China Sea. The southwest monsoon over the Andaman Sea, south, and Gulf of Thailand will strengthen.
Residents should beware of dangers from heavy to very heavy rain and accumulated rainfall that may cause flash floods and mountain runoff. People in foothill areas near waterways and lowlands should avoid traveling through frequently flooded routes, especially low-lying areas prone to short-term waterlogging.
Meanwhile, from September 11-13, 2026, the strong low-pressure area in the central South China Sea is expected to intensify into a tropical cyclone and approach the upper coast of Vietnam around September 13-14. The public is advised to continuously follow weather updates during this period.
For safety and to minimize potential impacts, people should carefully plan their activities and travel during this time. The public is urged to monitor announcements from the Meteorological Department and can follow updates on the department’s website.http://www.tmd.go.thor by calling 0-2399-4012-13 and 1182, available 24 hours.
10 September 2026
11 September 2026
12 September 2026
13 September 2026
