The provinces of Namur and Walloon Brabant south-east of the capital city Brussels were particularly hit.
They had already been badly hit by the devastating floods that left 36 people dead and seven missing in the nation of 11.5 million inhabitants last week.
Flood damage in Vaux-sous-Chevremont, Belgium (AP)
Belgium’s crisis centre issued a warning to the population as the bad weather is expected to last for several days.
Heavy rainfall caused significant damage in Dinant, where piles of cars were strewn across the town.
Deputy mayor Robert Closset said firefighters were deployed to tackle floods he described as worse than last week.
New floods hit Belgium amid thunderstorms and heavy rain
yourlocalguardian.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yourlocalguardian.co.uk Daily Mail and Mail on Sunday newspapers.
New floods hit Belgium amid thunderstorms and heavy rain
keighleynews.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from keighleynews.co.uk Daily Mail and Mail on Sunday newspapers.
New floods hit Belgium amid thunderstorms and heavy rain
bournemouthecho.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from bournemouthecho.co.uk Daily Mail and Mail on Sunday newspapers.
New floods hit Belgium amid thunderstorms and heavy rain
bromsgroveadvertiser.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from bromsgroveadvertiser.co.uk Daily Mail and Mail on Sunday newspapers.