The number of shoppers on the High Street decreased 7.5 per cent year-on-year in May.
This figure was down 3.3 per cent month-on-month compared to April.
The run rate of the RTI for the year-to-date is down 6.2 per cent year-on-year.
However, Ipsos Retail Performance reckons retail can recover in June thanks to the Diamond Jubilee, Olympic Games and the Euro football championships.
Dr Tim Denison, head of retail intelligence at Ipsos Retail Performance, said: "In May last year, the UK was enjoying a mini-bounce in confidence on the back of the royal wedding, so the comparative is a strong one this month.
"However, overall the health of retailing is continuing on its downward trajectory and even the weather has continued to conspire against retailers.
“After the bank holiday week and Jubilee celebrations, High Street retailers will be pinning their hopes on sporting events such as the Games and Euro 2012 football tournament.
"If these can help to lift the nation’s spirits, then shopper numbers could be swelled. If this happens, High Street retailing in the UK will be in a far better position in a couple of months than it is right now.”
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