The government is closely monitoring heavy rainfall in Phetchaburi and water levels at Kaeng Krachan Dam, while the southern region and Chachoengsao face risks of flash floods and sudden water surges. Meanwhile, the Meteorological Department has reported that rainfall conditions in the central region will improve from 12 to 14 October.
At 10:00 AM on 4 Oct 2026 at the Government House, Ms. Lalida Pertviwatana, Deputy Spokesperson of the Prime Minister’s Office, reported on the joint information center's flood situation. The latest reports show water levels beginning to recede in the Mae Klong and Chao Phraya river basins. Special attention is required for Phetchaburi Province due to factors involving Kaeng Krachan Dam and expected rainfall around 10 October. The southern region and Chachoengsao Province also remain at risk. On the same day, water flow through Nakhon Sawan was measured at 2,200 cubic meters per second, while Chao Phraya Dam discharged 2,500 cubic meters per second. These discharge figures help indicate water flow direction. Areas along the riverbanks with added water include Uthai Thani, Chai Nat, Sing Buri, Ang Thong, Phra Nakhon Si Ayutthaya, Pathum Thani, Bangkok, Samut Prakan, and Nonthaburi provinces. The public is urged to closely monitor official announcements.
Ms. Lalida added that in the Mae Klong river basin, areas to watch closely include Bang Khonthi and Amphawa districts due to floodwaters awaiting drainage into the Mae Klong River. In Chachoengsao Province, several roads are flooded, requiring increased caution for travelers and consultation of routes with the Department of Highways. In Bangkok, floodwaters remain on Chaokhun Thahan Road, Chalong Krung Road, Luang Paeng Road, in front of Lotus Lat Krabang, and along Lat Krabang Road. The public is advised to avoid these traffic routes.
Ms. Lalida further stated that the Meteorological Department forecasts rainfall today in the northeastern region, with rain expected on 5 October in the lower central region, Bangkok, and the south. Rainfall in the northeast will decrease. On 6 October, heavy rain is forecast for the south, western, and eastern regions, with warnings of flash floods and sudden runoff in the south. From 10 to 11 October, rain will affect the lower central region, particularly Bang Khun Thian District in Bangkok, as well as Phetchaburi and Prachuap Khiri Khan provinces.
Mr. Fata Matsathavee, a specialist in meteorological forecasting systems development, stated that on 4 October there will be rain in the northeast due to low atmospheric pressure moving in, including the upper northern region, especially the eastern part. Then, the cold air mass will shift westward. On 5–6 October, impacts will affect the north, central, east, upper south, and Bangkok, while rainfall in the northeast will decrease. Afterwards, rain will move to the western north and south. On 8–9 October, rain is expected in the south as high pressure begins to cover the area. On 10–11 October, during the seasonal transition, rainfall will occur in the central region, Bangkok, metropolitan area, east, and south. From 12 to 14 October, rainfall in the central region will improve, with rain continuing in the south.