At least 6 people were killed and over 8 lakh affected in 21 of the 33 districts of the flood-hit Assam.
Of them, Dhemaji and Lakhimpur in Upper Assam and Bongaigaon and Barpeta in lower Assam are the worst-hit districts.
The Brahmaputra river - one of the largest rivers in the world that cuts through Assam's biggest city Guwahati - and five other rivers are flowing above the danger mark, officials said.
Over 27,000 hectares of farmland are under floodwater and over 7,000 people have been evacuated to 68 relief camps across the state, according to reports.
Ferry services across Assam were stopped on Friday after the weather office forecast more rain this weekend.
The affected districts are Dhemaji, Lakhimpur, Biswanath, Sonitpur,Darrand, Baksa, Barpeta, Nalbari, Chirang, Bongaigaon, Kokrajhar, Goalpara, Morigaon, Hojai, Nagaon, Golaghat, Majuli, Jorhat, Dibrugarh, Tinsukia and Sibasagar.
Officials said that floodwaters from the higher areas will flow towards the valleys, worsening the situation in Lower Assam areas.
Bhutan has also issued a flood warning for areas in the foothills.