A moderate rain on Monday inundated parts of the capital and submerged important roads in Sylhet, threatening fresh floods in the northeastern district.
The Met Office recorded one millimeter of rainfall in the capital until 3pm.
North-eastern Sylhet, meanwhile, experienced heavy rains, with the weather office recording 124mm of rainfall in the district from 6am to 12pm on Monday.
The monsoon is fairly active over Bangladesh and moderate elsewhere over North Bay, according to a Met Office bulletin.
The Flood Forecasting and Warning Centre (FFWC) has said that there is a chance of medium to heavy rainfall at some places in the north-eastern part of the country and the adjoining upstream in India on Tuesday.
As a result, the major rivers of Sylhet, Sunamganj and Netrokona districts in the north-eastern region may rise rapidly during this period.
The Ganges-Padma rivers are on a rising trend, which may continue for the next 24 hours. All the major rivers in the north-eastern region of the country are rising, which trend may continue over the next 24 hours. The Brahmaputra has also been rising.
Meanwhile, rivers in the northeastern district of Sylhet swelled following three days of heavy rains in the region and upstream in India, raising fears of another round of flooding this year.
Incessant rains since early Saturday saw many parts of Sylhet city going under knee-deep water. Vast areas of the city have been hit by acute waterlogging. Water has also entered houses and shops, causing immense sufferings for people living in low-lying areas, reported UNB.
According to the FFWC, the water level is rising fast in rivers flowing through Sylhet and Sunamganj. Floods are likely to affect these two districts within this week. However, losses will be minimal as no crop is currently being cultivated in the division's haor areas.
"The current bout of rain will continue till September 6, while another round may drench Sylhet division next week," said Saeed Ahmad Chowdhury, a senior meteorologist at Sylhet Meteorological Center.
Arifuzzaman Bhuiyan, an executive engineer of FFWC, said that another round of floods is on the horizon.
"Heavy rain is going on upstream. As a result, floodwaters will continue inundating the Teesta basin and Sylhet division for most of this week. But the increased level of water won't last long," Arif said.
According to a forecast by the Bangladesh Meteorological Department (BMD), seasonal air will cause rain in Sylhet division for the next few days.
In June, record-level floods inundated almost 80% of Sylhet division. The deluge that ravaged the region from June to August claimed more than 80 lives and forced many to flee their flooded homes and take shelter on highways and buildings and on whatever little dry places had been left.
Our correspondent Md Serajul Islam, Sylhet contributed to this report.