On Thursday, the authorities reported 107 flood-related deaths.
"Confirmed deaths: 113," the official bulletin said.
At least 756 people have been injured so far and more than 337,100 were forced to leave their homes, according to the latest data.
Heavy rainfall in Brazil's southernmost state of Rio Grande do Sul on the border with Uruguay started on April 29, resulting in devastating floods. Flooding on the Guaiba River, which flows through the state capital, Porto Alegre, has so far become the worst since 1941.