President Samia Suluhu Hassan on Monday said on X that a further 85 people were still receiving treatment in hospital.
The floods and landslides have affected 1150 households, or 5600 people, with more than 300 hectares of farmland destroyed.
Severe flooding caused by the El Nino and Indian Ocean Dipole weather phenomena has forced hundreds of thousands from their homes in Kenya, Somalia, Ethiopia and Tanzania since the rains began.
The flooding comes on the back of the worst drought to hit the region in 40 years. Dry soils are less able to absorb water, increasing the risk of flash-flooding.
Queen Sendiga, commissioner of the Northern Manyara region, told reporters late on Sunday that authorities were still searching for bodies trapped in the mud.
About 100 houses in the village of Katesh, Hanang district, were swallowed by a landslide, Sendiga said, adding that they did not know the whereabouts of people from 28 households.
Television footage showed streets turned into fast-flowing rivers of mud carrying debris past flooded houses.
Climate change is causing more intense and more frequent extreme weather events, according to climate scientists.
In response, African leaders are pushing for new global taxes and changes to international financial institutions to help fund climate change action.
In neighbouring Kenya, where floods have so far killed at least 142 people, the banks of the Voi River in the country's south burst on Monday, the Kenya Red Cross said on X, adding its personnel were helping with rescue efforts.
