The number of people who accessed emergency accommodation rose to 14,159 last month.
That is an increase of 150 on the previous month, when homeless figures surpassed 14,000 (14,009) for the first time.
Data from the Department of Housing, shows that in May, 9,843 adults and 4,316 children were in emergency accommodation.
The latest figures mean that there has been a 14% rise in those who have entered emergency accommodation in the 12 months.
Since May last year the number of families in emergency accommodation has increased by 16% while the number of homeless children has increased by 17%.
Sinn Fein’s Housing Spokesperson Eoin O’Broin said that despite the month on month rise in the figures, the Government has refused to make any changes to its “failing housing plan”.
Deputy O’Broin said that since the Government ended the ban on no fault evictions last year, homelessness increased by 15%.
In a statement he said: “This Government has neither the will nor the policies to tackle the escalating homeless crisis. How could they, they are the cause of that crisis.”
The Simon Communities of Ireland has described the next six months as “an important window of opportunity in the fight against homelessness”.
Executive Director Wayne Stanley said Budget 2025 and the next programme for Government would set the framework for success or failure.
He said the homeless crisis should not feed a sense of “fatalism”.
“Making progress on homelessness, even getting to the point where homelessness is short-term and quickly solvable, is possible,” he said.
Mr Stanley stressed the need for greater investment in social housing in Budget 2025, investment in health support for those in homelessness, and support to local authorities to invest in prevention services.
