The floods have caused massive devastation in the state affecting more than six million people and killing atleast 176. Thousands are homeless and have been displaced by the rescue workers to a safer place.
The IMD warning has caused panic in the state. The weather department has asked the state to be on alert and to begin rescue and relief operations if necessary.
"The IMD informed us that there is a possibility of heavy rains and near cloud burst- like situation in the next week of September in the districts bordering Nepal," said Vayasji, principal secretary of the disaster management department.
This will create havoc by affecting more areas and more people in flood-prone districts in north Bihar, he added.
170 killed, 5 million affected by floods
About 20 districts are reeling under the weeklong floods and this weather warning spells disaster.
The villagers demanded immediate provision of relief material and also adequate supply of boats. The flooding has been caused after the embankment of the river Ganga breached and entered several villages.
The floods have also destroyed the crops in the region.
(With agency inputs)