According to the Department of Disaster Prevention and Mitigation, flash floods from heavy monsoon rains have also killed 22 people recently, with disaster officials warning of more sudden flooding this week.
The Bangkok flood response unit on Tuesday, August 27, placed sandbags along the Chao Phraya River banks to prepare for floods.
The department also warned that 31 provinces in the north and northeast could face flash floods until Thursday.
"The department has ordered local authorities to monitor the weather closely... and put teams and equipment on standby. People should also follow the weather forecast and take warnings seriously," a statement said.
Although Thailand experiences annual monsoon rains, man-made climate change is intensifying weather patterns, increasing the likelihood of destructive floods.