Meteorological Department Issue 3: Check Provinces to Prepare for Heavy Rain from 17-20 Sep 2026

Local16 Sep 2026 07:40 GMT+7

The Meteorological Department issued its third warning of heavy to very heavy rain nationwide, listing provinces to prepare for flash floods and forest runoff from 17-20 September 2026.

16 September 2026 GMT+7Meteorological DepartmentAnnouncement on Heavy to Very Heavy Rain in Thailand and Strong Winds in the Andaman Sea (Effective 17 - 20 September 2026), Issue No. 3 (207/2569).

From 17 to 20 September 2026, Thailand will experience heavy to very heavy rain in some areas, beginning in the northern and northeastern regions on 17 September 2026, followed by the central, eastern, and southern regions on the next day (18 September 2026).

This is due to a high-pressure system or cold air mass from China covering upper northern and upper northeastern Thailand, causing the monsoon trough to shift southward across lower central, eastern, and upper southern regions. In addition, the southwest monsoon blowing over the Andaman Sea, Thailand, and the Gulf of Thailand is strengthening.

Residents across Thailand are advised to be cautious of heavy to very heavy rain and accumulated rainfall that may cause flash floods and forest runoff. Those living near foothills, water flow routes, and lowlands should avoid traveling through flood-prone areas, especially low-lying zones prone to short-term flooding.

Meanwhile, winds in the Andaman Sea are quite strong, with waves 2-3 meters high, and over 3 meters high in stormy areas. Boat operators in the Gulf of Thailand and Andaman Sea should navigate with caution and avoid areas with thunderstorms. Small boats in the Andaman Sea should refrain from departing from shore during 17-20 September 2026.

For safety and to minimize potential impacts, the public is urged to carefully plan daily activities and travel during this period. They should follow announcements from the Meteorological Department and can access information via the department's website.http://www.tmd.go.thOr call 0-2399-4012-13 and 1182, available 24 hours.