Most of northern Italy remained under red alert on Tuesday, as torrential rains and winds of up to 180 kilometres an hour lashed the country.
The five regions under red alert were: Friuli-Venezia Giulia, Lombardy, Trentino-Alto Adige, Liguria and Veneto.
Two young people were killed on Monday when a tree crushed the car they were travelling near Frosinone, south of Rome.
A falling tree also killed a man in Terracina, south of the Italian capital, and another in Naples, authorities said.
Near the Ligurian city of Savona, a woman was killed by a falling piece of cornice.
Authorities on Tuesday reported a woman died when her home was buried by a mudslide in the northern region of Trentino, a man was killed in Veneto by a falling tree, and a firefighter died during relief operations in South Tyrol.
A man was killed while kitesurfing on Monday near the town of Cattolica on the Adriatic coast, while the body of another man was recovered on Tuesday in Lake Levico, in Trentino.
Meanwhile, a boat owner is still missing after a sailboat was smashed against a pier by strong winds in the southern region of Calabria on Sunday.
He was the owner of the Canadian-flagged boat, from which others may also be missing.
Local media have also reported that around 170 people were stranded by heavy snowfall at the Stelvio Pass on the border between Italy and Switzerland.
Dozens of people across Italy are reported wounded amid two days of wild weather, including several firefighters.
5,800 firefighters responded to over 7,000 incidents on Tuesday, Italian authorities said.
Many roads remained blocked, while schools were ordered closed and thousands were left without power.
