PATTAYA, Thailand – Thailand has officially entered the rainy season as of May 15, following confirmation from the Thai Meteorological Department (TMD) that weather conditions have met all required criteria, including widespread rainfall and the establishment of the southwest monsoon.
The rainy season in upper Thailand is expected to last until mid-October, while southern coastal areas, including Pattaya and nearby parts of Chonburi, may continue experiencing unsettled weather and periodic rainfall into the end of the season. The TMD forecasts total rainfall nationwide to be about 10 percent below normal this year due to weak El Niño conditions expected to persist, which may also result in slightly higher-than-average temperatures.
Authorities have warned of a likely dry spell between late June and early July, which could impact water availability and agricultural planning, particularly in non-irrigated areas. Residents and farmers are urged to prepare for reduced rainfall during this period. From August to October, rainfall is expected to intensify again, with the possibility of 1–2 tropical storms affecting Thailand, increasing the risk of flash floods and runoff in several regions, including the eastern seaboard and tourist provinces such as Pattaya.
In the short term, heavy to very heavy rainfall is expected between May 15–18 due to a low-pressure system over the Bay of Bengal. The Andaman Sea is also expected to see waves of 2–3 meters, with small boats advised to remain ashore. The TMD has urged the public, including residents and businesses in Pattaya and other tourist areas, to closely monitor weather updates and follow official warnings to reduce risks from rapidly changing conditions.
