Diesel prices in Portugal rose by three cents per liter, while gasoline became two cents more expensive, according to a report by Jornal Economico.
The latest increase at the pump underscores the persistent upward pressure on consumer energy costs across the region.
Diesel and gasoline prices in the eurozone jumped significantly in May, with diesel up 29% and gasoline rising 16% year-on-year.
The price hike adds to a broader trend of elevated fuel costs in the European Union.
Diesel and gasoline prices in the eurozone jumped significantly in May, with diesel up 29% and gasoline rising 16% year-on-year.
This surge in fuel costs has been a primary driver behind the eurozone's consumer price index, keeping inflationary pressures high.
In the United States, consumer prices also accelerated at their fastest pace in more than three years during May.