Valencia, which is on Spain’s eastern Mediterranean coast, registered 201.1 litres of rain per square metre over a span of 24 hours, the largest rainfall registered for the month of May since records began to be kept in 1871.
Local media reported tunnels had been closed and the metro system was also shut.
Torrential rain caused delays in highways and video footage showed cars submerged under water.
Valencia’s fire department reported it had carried out several rescue operations where people were trapped in their cars in heavily flooded areas.
With the rain showing no sign of abating, Spain’s weather agency AEMET designated a yellow alert for the region on Wednesday (May 4).