
City Hall has warned communities along the Chao Phraya River to brace for flooding from Friday until Tuesday.
Nine provinces in the Central Plains Region have also been alerted after the Pasak Jolasid Dam sped up water discharges.
Bangkok governor Aswin Kwanmuang said heavy rain would move across the lower Central Region and the upper South.
"City Hall is monitoring the situation, particularly in low-lying areas along the Chao Phraya River in Bangkok,'' he said.
He alerted Bangkok communities living along the Chao Phraya River, Klong Bangkok Noi, and Klong Mahasawat to prepare for flooding in the coming days.
There are a total of 239 households in 11 communities located outside the embankments in Bang Sue, Dusit, Phra Nakhon, Samphanthawong, Bang Kho Laem, Yannawa, Klong Toey, Bangkok Noi, and Klong San districts.