Water resource experts assess that the water situation in Bangkok is beginning to stabilize and is unlikely to worsen beyond the current level. From now on, rainfall is expected to shift toward the western region, specifically Kanchanaburi province and the lower northern area.
On the evening of 26 September 2026, reporters covered the rain and flooding situation in Bangkok and its metropolitan area following unstable weather conditions with heavy to very heavy rainfall, causing water to overflow onto many roads and resulting in traffic congestion.
Recently, Assistant Professor Dr. Sitang Pilailar, a lecturer in the Department of Water Resources Engineering at the Faculty of Engineering, Kasetsart University, posted an analysis on her personal Facebook page Sitang Pilailar, updating rainfall and water data as of 26 September 2026 at 16:00.
She stated, “The situation in Bangkok will stabilize and not get worse. On Monday, people can go to work without needing boats.”
Regarding the next areas, the west—Kanchanaburi—is expected to receive very heavy rain, along with Suphanburi, the lower northern region, lower Tak, Nakhon Sawan, and Uthai Thani. The eastern region still has rain, and in Sa Kaeo, flooding continues and will send water toward Prachinburi... Prepare to move belongings to higher ground.” ***
** In the Rangsit area, water levels should decrease and dry out quickly because water discharge there has been reduced to allow Rangsit to pump out water and dry out more effectively. **
** In the central region, including Sing Buri, Ang Thong, and Uthai Thani provinces, sandbagging efforts have begun. **
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* The Chao Phraya Dam is likely to increase discharge from the current 1,950 cubic meters per second to 2,300, with a maximum of 2,500, depending on rainfall during this period.
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--> Reviewing rainfall data from the past 24 hours, Bangkok suffered heavily with over 100 mm of rain across many areas in a “well-distributed” pattern (which is unfortunate because it worsens the water situation), including Bang Na, Bang Kapi, Bang Bua, Bang Khen, Chatuchak, Lat Phrao, and Don Mueang.
... This pattern of widespread heavy rain caused all canals to fill with water, with Saen Saeb canal overflowing. High tide pushed seawater inland, worsening the situation. Consequently, water levels will continue to rise as the rain persists.
Today, Bangkok and the central region still expect rain (including nearby provinces such as Phetchabun and Prachuap Khiri Khan). Tomorrow, rainfall will decrease, and after Sunday, the situation should gradually return to normal.
Currently, there is no need for Bangkok residents to worry excessively... Just stay home and stay safe today.
Rainfall is expected to shift westward toward the lower northern region, including Kanchanaburi, Suphanburi, and Phetchaburi. On Monday, the Vajiralongkorn Dam may gradually increase water discharge in stages, but heavy rain may still occur in Kanchanaburi tomorrow.