Japanese retailer Fast Retailing saw domestic same-store sales decline 10.3% during May, which it attributed to cooler weather and fewer weekends and public holidays over the month.

The company, which operates the Uniqlo chain, said sales on its own stores declined 7.3%, while total sales sales, including online sales, were down 6.9%.

"Despite strong sales during the Golden Week holiday in early May and our campaign to celebrate Uniqlo's 28th anniversary in late May, same-store sales for the whole of May dipped year on year with two fewer Saturday, Sunday and public holidays for shopping compared to the previous year, and cool weather in the middle of month dampening sales of summer garments," the company said.

The company closed two stores over the month.