The flash estimate from the national statistics office was 0.1 percentage point lower than forecasts by economists surveyed by state news agency PAP.
“Just like in August, inflation remains below 3 percent,” Tusk wrote on X.
"The most important and difficult election promise—putting an end to the PiS-era soaring prices—has been fulfilled," he added, referring to the previous right-wing government led by the Law and Justice (PiS) party.
Finance and Economy Minister Andrzej Domański pointed to declining food prices as a "particularly encouraging" trend.
September's reading was the third consecutive month within the central bank’s 2.5-percent target range, with a margin of 1 percentage point in either direction, analysts said.
Inflation was also 2.9 percent in August and 3.1 percent in July, according to the Statistics Poland (GUS) agency.
The government’s 2025 budget assumes average inflation of 3.1 percent next year.
The central bank, in a July forecast, predicted inflation would average 3.9 percent in 2025 before easing to 3.1 percent in 2026 and 2.4 percent in 2027.
(gs)
Source: IAR, PAP, polskieradio24.pl