A man sits near houses partially submerged in flood waters in Asuncion, capital of Paraguay, Dec 27, 2015. [Photo/Agencies]

In Uruguay, more than 9,000 people have had to flee their homes, according to the national Emergencies Office, which added that it expected water levels to remain at their current level for several days before subsiding.

At least four people have died in Argentina and Uruguay due to the storms and floods, according to local media reports. One was reported to have drowned while another was electrocuted by a fallen power cable.

Brazil's President Dilma Rousseff also flew over the flooded areas on the border with Argentina and Uruguay on Saturday morning. Rio Grande do Sul state Civil Defense said 1,795 people were left homeless there after 38 towns were affected by heavy rains.