Restrictions have been imposed on shopping malls there, while hotels, theatres, cinemas, museums and swimming pools in the region will have to shut for now.
On Monday, similar measures will take effect in the central Mazowieckie region, which includes the national capital Warsaw, and the western province of Lubuskie.
Meanwhile, a range of restrictions on public life were last month introduced in the Warmińsko-Mazurskie region of northeastern Poland, another province in which the level of infections has caused concern.
Pandemic restrictions in the rest of the country will remain unchanged until at least March 28 following an easing of containment measures earlier this year.
Public health officials have warned that the daily number of new COVID-19 infections in Poland is starting to rise again in a worrying new trend.
Poland on Saturday reported 21,049 new coronavirus infections and 343 more deaths, bringing its total number of cases during the pandemic to 1,889,360 and fatalities to 47,068.
The country reported its highest daily toll of 674 coronavirus-related deaths on November 25.
On November 7, the Polish health ministry confirmed 27,875 new single-day cases, the most since the pandemic hit the country last March.