The latest figures from the Central Statistics Office show prices on average were 5.9% lower at an annual rate in August, unchanged from the July rate.
Prices for clothes and footwear rose by 3.4% in August as the traditional summer sales came to an end.
The costs for housing, water, electricity, gas and other fuels increased by 1.1% due to higher average mortgage interest repayments.
Transport costs also rose by 1.1% due to increases in airfares and petrol and diesel prices.
Food prices, however, fell by 1% in August.
