Some 998 families were homeless in the Dublin region last month, according to the Dublin Regional Homeless Executive.
It compares to 607 families in emergency accommodation in August 2015, or an increase of 64% on the previous year.
In the last month 72 new families were placed in emergency accommodation in the Dublin area.
The DRHE said from January to June of this year, 825 households moved from homeless accommodation into their own tenancies.
Of the 825 tenancies, 384 were local authority lettings and 388 tenancies were provided through the Housing Assistance Payment (HAP) pilot, while the remaining 52 returned to renting in the private sector.
The Agency said the net monthly increase in families last month was five compared to the previous month.
Mike Allen, Director of Advocacy with Focus Ireland, has said that there should be a much better response to homelessness, saying there is no leadership at national level.
Speaking on RTÉ News at One, Mr Allen said that local authorities are "trying to do their best" but described the system as "completely and utterly dysfunctional".
He added that the Government needs to set out regulations and provide resources so that frontline services can respond to families' needs.