The latest figure was 0.1 percentage point above a flash estimate released by the Statistics Poland (GUS) office in mid-August.
Investment rose 8.4 percent, while private consumption increased by 2.8 percent in the second quarter of 2026, Statistics Poland reported.
Domestic demand went up by 3.5 percent, it said.
Economists polled by state news agency PAP had expected investment to grow 7.7 percent, private consumption to rise 3 percent and domestic demand to increase 3.9 percent in year-on-year terms.
In quarter-on-quarter terms, Poland's gross domestic product grew 1 percent in the second quarter of 2026, after expanding 0.6 percent in the first three months of the year, Statistics Poland said.
Poland's gross domestic product expanded by 4.1 percent in the final quarter of 2025, according to Statistics Poland.
In 2025 as a whole, the Polish economy grew 3.6 percent, after expanding by 3 percent in 2024, according to an estimate released by Statistics Poland at the end of January.
Poland's president in January signed the country's 2026 budget, which expects the economy to grow 3.5 percent this year.
Polish GDP is expected to grow 3 percent next year, under the country's 2027 budget approved by the government on Friday.
(gs)
Source: PAP, IAR