The pair were among three people who were injured Saturday when the wall collapsed near the seafront at the port of Roda de Bera, about 75 kilometres (45 miles) southwest of Barcelona.
The mother and her 18-year-old daughter had been sheltering at a stall at a market when the force of the water caused a wall separating a street from a private property to collapse on them, according to Spanish media reports.
Roda de Bera town hall said in an Instagram post that the two women, who had been in critical condition, had died and declared two days of official mourning.
Catalan regional president Salvador Illa expressed his condolences to the women's family on X, saying the news had "hit us deeply" and offering his full support during the "painful moments".
A total of 11 people were injured in the storm, which forced the evacuation of a campsite and a nightclub, flooded streets and left people trapped in cars.
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