According to Assam State Disaster Management Authority, two persons were killed at Bokakhat in Golaghat district taking the toll to 31.
Nearly 17 lakh people have been affected in 2,266 villages in 21 districts in the state, with Morigaon being the worst-hit.
Authorities are running 463 relief camps and distribution centres, where almost 1.5 lakh people have taken shelter in 18 districts.
Brahmaputra river is flowing above the danger mark at Nematighat in Jorhat, Goalpara and Dhubri towns.
In Bhiwandi, nine persons were killed when a building collapsed due to heavy rains while incessant downpour in Mumbai, Thane and Palghar hit normal life.
Lightning strikes in Odisha have claimed 41 lives in the past two days. Heavy rainfall and thundershower coupled with gusty surface wind are likely to lash several parts of Odisha due to a low pressure area over the Bay of Bengal. The meteorological centre in Bhubaneswar said rain or thundershower is very likely to occur at most places over north and south Odisha tomorrow. Gusty surface wind with 35 to 45 kmph speed and up to 50 kmph may prevail along and off south Odisha coast.
Sea condition would be moderate to rough in south Odisha coast and fishermen are advised to be cautious while venturing into sea.
In Bihar, where the flood toll stood at 26, an estimated 27.50 lakh people have been affected in 12 districts, though no fresh casualty was reported.
Rivers including Ghaghra, Bagmati, Koshi and Mahananda are flowing above the danger mark at several places. The floods have also damaged crops in 3.39 lakh hectares of land.
Uttar Pradesh continued to receive heavy downpour with many rivers, including the Ganga and Sharda, flowing near or above the danger mark, creating flood-like situation in several villages in the catchment areas.
In Uttarakhand, five pilgrims were injured following a landslide in Rudraprayag where incessant rain led to blocking of several roads including the Chardham yatra routes.