Heavy to Very Heavy Rain in Thailand No.9 (136/2026)

Weather Advisory

Subject: Heavy to Very Heavy Rain in Thailand

No.9 (136/2026)

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During 27–30 July 2026, the monsoon trough lies across the North and the upper Northeast of Thailand while the rather strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf. Isolated heavy rains are forecast in the country and isolated very heavy rains are possible in the North, the Northeast, the Central, the East and the South (west coast) regions. People should beware of heavy to very heavy rains and accumulation that may cause flash floods, overflows and landslides especially along the waterways near foothills and lowlands.

The rather strong winds force the waves in the upper Andaman Sea up to 2–3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea and the upper Gulf, the waves are expected to be about 2 meters high and above 2 meters high in thundershowers. All ships in the Andaman Sea and the Gulf should proceed with caution and keep off thundershowers, small boats in the upper Andaman Sea should keep ashore.

                                  The advisory is in effect on 27 July 2026, at 5.00 p.m.
                                              This next issue will be on 28 July 2026, at 5.00 a.m.

                                                                 (Signed)    Sugunyanee Yavinchan

                                                                           (Miss Sugunyanee Yavinchan)                            

                                                                                     Director-General                        

                                                                         Thai Meteorological Department