Following a break after the weekend, it began to rain again late on Wednesday, causing increased concern as overflowing rivers turned streets into waterways and caused (m) millions of US dollars-worth of damage.
In the city of Lujan, 70 kilometres (40 miles) from Argentina's capital, Buenos Aires, the local river reached its highest level in 25 years, according to authorities.
Floodwaters have swept into residential areas, destroying homes and inundating the city's main arteries.
The national government has acknowledged the need for more drainage works in the area.
Many local residents have blamed poor infrastructure for the destructive flooding.
The provincial government however says the drainage works demanded by residents are being carried out and already helped reduce the damage from the latest flooding.