Rain-triggered floods and mudslides have left a trail of destruction in other parts of south Asia. Officials in northeastern India have reported at least a dozen people dead and over a million affected.
The dead included two schoolchildren who were buried when their boarding school collapsed while they were asleep in Tawang in Arunachal Pradesh state.
Assam's State Disaster Response Authority said around 900,000 people spread over 21 of the state's 33 districts have had their homes submerged. Several thousands are living in government-run relief camps.
Elsewhere in Assam, Kaziranga National Park, home to the endangered one-horn rhinoceros, has been flooded. The park is located 225 kilometers east of Gauhati, the state capital.
Floods and mudslides have also hit some other northeastern states, including Meghalaya, Sikkim and Mizoram. In Mizoram, floods have submerged about 400 homes in the small town of Tlabung, police said.