In India and Bangladesh, at least 59 people have perished as a result of lightning strikes and landslides caused by strong monsoon rains.
Millions of people have been left stranded, and rescuers have struggled to reach individuals who have been affected.
Flooding is predicted to worsen over the following three days, according to forecasters.
Officials from Bangladesh's government have labeled the recent flooding as the worst since 2004.
Unrelenting rains have inundated large swaths of the country's north-east area in the previous week, exacerbated by runoff from torrential downpours throughout India's highlands.
As a result of rising seas, schools have been turned into impromptu shelters, and troops have been dispatched to evacuate households cut off from neighboring areas.
"By early Friday, the whole hamlet was under water, and we were all stuck," Lokman, whose family lives in Bangladesh's Companiganj village, told the AFP news agency.
"After waiting on the top of our house for a day, a neighbor came to our rescue with a handmade boat. "In her whole life, my mum has never seen such floods," the 23-year-old stated.
More than 1.8 million people in Assam, India's neighbor, have been hit by floods following five days of nonstop rain.
Himanta Biswa Sarma, the Chief Minister of Assam, told reporters that he has asked district authorities to offer "all required support and relief" to individuals affected by the flooding.
"Our house has been flooded." Husna Begum, a resident of Udiana village in Assam, told the BBC, "I've never seen such massive floods in my life."
Since Thursday, the 28-year-old has been living with her children in a flimsy plastic tent. "In this camp, there is no drinking water." "My son has a fever, but I can't get him to the doctor," she explained.
The extent of the floods was reported by Ronju Chaudhary, who lives in the same area. "We are encircled on all sides by water. He said, "There's water inside our homes as well."
The rains arrive as Bangladesh's Sylhet area is still reeling from the worst floods in almost two decades, which killed at least ten people in late May.
Former congressman Syed Rafiqul Haque stated Bangladesh was on the verge of a humanitarian disaster, with "almost the whole Sylhet-Sunamganj region... under water and millions of people... trapped."
Officials estimate that 3.1 million people have been displaced in the region, with 200,000 of them currently living in improvised shelters on higher ground.
Seasonal monsoon rains provide a lifeline for farmers across South Asia, but they also result in lives and property devastation each year. In recent years, both Bangladesh and India have suffered more severe weather.
While environmentalists can not attribute individual weather occurrences to climate change, they do warn that it might lead to additional disasters, particularly in low-lying and heavily populated areas.
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