Tourism Ireland has said the ongoing effect of Brexit-led "consumer concern" is having an impact on visitor numbers to the country.
It said visitor numbers have shown a "modest" rise for the first seven months of this year but a slight fall in July.
Areas of concern for the Irish tourism industry include the discontinuation of Norwegian Airlines flights from North America to Ireland, as well as the suspension of some Chinese flights, along with ongoing Brexit uncertainty and the weak value of Sterling.
The total number of trips to Ireland fell by 0.5% to 1,155,100 last month.
Trips by residents of Britain rose slightly while trips from the US and Canada fell by 2.7% and from other parts of Europe, apart from Britain, were down by 0.7%.
However, during the first seven months of this year, the total number of trips to Ireland increased by 2.8% compared to the same period in 2018 - up from 6,033,100 to 6,203,600.
Tourism Ireland CEO Niall Gibbons said: "Brexit certainly remains a very real and ongoing challenge, giving rise to consumer concern, particularly in Britain and some mainland European markets.
"The fall in the value of sterling has made holidays here more expensive for British visitors, and has made Britain more affordable for visitors from many of our top markets.
"The figures for January to July indicate a very mixed picture," Mr Gibbons said, highlighting the "modest performance and some continuing underlying weakness" from Britain and mainland Europe.
"Feedback from industry partners on the ground suggests weaker demand in the peak summer season and a late booking pattern, with concern being expressed for the remainder of 2019," he said.
Mr Gibbons added that 2.5% more airline seats are available this summer to Ireland than last year, but capacity is deteriorating because of the cancellation of Norwegian flights and suspension of some Chinese flights until next year.
Meanwhile, Irish people have been going abroad more this year than last year, with the number of trips overseas up by 7% in July at 968,900; and breaking the five million barrier for the January-July period, compared to 4.752 million during that time last year.
Tourism Ireland has a €12m "autumn campaign" under way to promote the country for the off-peak seasons.
