The death toll is likely to rise further as the hunt for bodies goes on, Brazil's Civil Defence said.
Brazil's National Space Research And Climate Studies Centre said that in the first five days of January the Mantiqueira mountains near Rio de Janeiro received half the usual average monthly rainfall.
Most deaths occurred in Rio de Janeiro state when shacks built illegally on steep slopes were swept away.
"The number of victims could rise further. The Civil Defence is still on alert and we're still searching for missing people," said Corporal Leonardo Franco from the Civil Defense.
Güncelleme Tarihi: 20 Eylül 2018, 18:16
More rain was likely to fall this weekend, the centre said.
Mudslides killed 16 Brazilians in Petropolis, an historic mountain resort near Rio, in January 2003. In December 2001, 52 people died in mudslides in Rio de Janeiro state.