The figure was in line with a forecast by economists polled by state news agency PAP.
Poland's gross domestic product expanded by 3.3 percent in the second quarter of this year, according to the state-run Statistics Poland (GUS) agency.
The Polish statistics office is expected to report full third-quarter data on December 1.
Poland's central bank this month predicted that the Polish economy would expand 3.4 percent this year, followed by 3.7 percent growth in 2026.
The country's 2025 budget expects the economy to grow 3.9 percent this year.
Polish GDP is expected to grow 3.5 percent next year, under the country's 2026 budget approved by the government in late August.
The World Bank last month maintained its forecast for Polish economic growth this year at 3.2 percent.
(gs)
Source: PAP, IAR