A year earlier, the EU inflation was 2.1%, the data showed.
Romanian annual inflation reached 8.5% in May, followed by Estonia (5.5%) and Lithuania (5%).
The lowest 12-month averages up to January were registered Ireland (-0.2%), Sweden (1.5%) and the Netherlands (1.6%), and the highest in Romania (7.5%), Greece (4.8%) and Estonia (4.5%).
Romanian consumer prices rose 0.2% in May compared with the month earlier. EU’s monthly inflation was 0.1%.
Annual inflation in the 16 states that use the euro was 2.7% in May, down from 2.8% in April. A year earlier, eurozone’s rate was 1.7%.