Some drivers abandoned their cars in the middle of streets that became flowing rivers of ice and were pictured slowly making their way through hail-covered streets.
Elsewhere in the city, buses were stopped and cars were abandoned after some streets were left severely flooded due to the rainfall.
A video captured icy water and hailstones running down escalators into an underground train station in the city.
Firefighters responded to similar incidents in Florence and Pisa. The storms even reached Sicily on Sunday, where the eastern province of Catania was hit by torrential rain for the second time in three days.
The severe weather also affected parts of northern Italy, including Milan, where strong winds toppled trees. In Bologna, the airport saw flights delayed due to difficult flying conditions.