Fast Retailing booked an increase in sales at its Japanese Uniqlo stores in May, after rising seasonal temperatures boosted demand for summer items.

Same-store sales rose by 4.1% during the month, compared to the same period last year. Sales at the casual clothing chain's own stores (which include new ones that are less than a year old) grew 7.7%. Total sales, including online, increased 7.4%.

Uniqlo closed three stores in May, taking its total number to 840.