Inbound travel to the US took a sizeable downturn even before Britain narrowly voted to leave the European Union, new figures show

International arrivals continued to register negative year-on-year growth in May due to factors including a strong US dollar, which will particularly weigh on travel from Canada.

Any fallout from the recent Brexit vote will begin to show in August’s version of the monthly US Travel Association Travel Trends Index.

But the organisation projects a “dour outlook” for international travel through to late 2016.

US Travel Association vice president for research, David Huether said that the Travel Trends Index “proves yet again that American leisure travellers, who account for 60% of travel spending in the US, will likely continue their role as engines of growth for the US travel industry in 2016.

“It will be interesting to see how global events, such as Britain’s recent vote to leave the European Union, affect these trends in the months ahead.”