The figure came in 0.1 percentage point lower than forecast by economists polled by state news agency PAP.
Poland's gross domestic product expanded by 4.1 percent in the second quarter of this year, after growing 3.7 percent in the first quarter, according to the state-run Statistics Poland (GUS) agency.
The Polish statistics office is due to report full third-quarter data on November 30.
Poland's central bank this month predicted that the Polish economy would expand 3.6 percent this year, followed by 2.8 percent in both 2027 and 2028.
The country's 2026 budget expects the economy to grow 3.5 percent this year.
Polish GDP is expected to grow 3 percent next year, under the 2027 budget approved by the government in September.
(gs)
Source: PAP, IAR