There was a 4.4% increase in July when compared to June.
Bar sales values were also up by 11.4% in the year to the end of July and by 4.5% on the June figure.
Final figures for June show bar sales volumes up by 6.2% in the 12 months to the end of June but volumes fell by 1.6% when compared with the previous month, May.
Sales values for the year to the end of June were up 6.4% but they were down 1.3% when compared to the previous month, May.
Preliminary estimates from the CSO put bar sales volumes up 7.6% for the three months May-July when compared with the same quarter in 2014.
The May-July quarter saw sales values in bars rise by 7.9% compared to May-July 2014.
Both volumes and values in bars showed growth of 4.3% when compared to the previous Feb-April quarter.
Retail sales volumes generally increased by 11.6% in July over June 2015.