Bangladesh may face a significant flood event between August and September this year, potentially affecting 20 to 30 districts, according to a forecast from Weather.com’s Chief Meteorologist, Mostofa Kamal Polash. The warning was issued on Monday through a post on his verified Facebook page.

In his statement, Polash indicated that current weather and hydrological patterns suggest the likelihood of a full-scale monsoon flood. He noted that since 2020, Bangladesh has not experienced such a widespread flood event. While the country saw flooding in Sylhet Division in 2022 and in Chattogram Division in 2024, those incidents were primarily flash floods or caused by mountain runoff. By contrast, a traditional monsoon flood involves the Ganges River basin in India overflowing into Bangladesh’s Padma River and inundating coastal districts, as well as extensive flooding along the Teesta, Brahmaputra, and Jamuna riverbanks.

Polash warned that in 2025, the river systems of the Padma, Teesta, Brahmaputra, and Jamuna could collectively cause flooding that would impact large parts of the country. He predicted that the possible flooding might occur between August 15 and September 10, affecting districts situated along these rivers.

He further explained that the anticipated flood would likely submerge vast areas of riverbank districts, creating a scenario similar to historical monsoon floods. This, he said, would be markedly different from isolated regional flooding and could have nationwide impacts.

At the end of his post, Polash included a note referring readers to a research-based article published on the Weather.com website, which presents evidence and analysis supporting the forecast of a major flood in the country. This analysis outlines hydrological, meteorological, and upstream river basin conditions that point toward a high probability of such an event occurring within the predicted timeframe.