On Saturday 22,200 refugees from Ukraine arrived in Poland, according to the agency.
Meanwhile, a total of 7.8 million people have left Poland for Ukraine, including 22,300 on Saturday, the Border Guard noted.
A deputy prime minister said in December that Poland was home to more than 2 million Ukrainians after many who had fled Russia's invasion moved on to other countries or decided to return to Ukraine.
Poland in March passed a bill that offers wide-ranging support to Ukrainians escaping the Russian invasion of their country, which began on February 24.
The measure grants them residence rights and ensures access to education, healthcare and social benefits.
Over 80 percent of Poles are in favour of accepting refugees from war-torn Ukraine, according to a recent survey.
Sunday is day 347 of the Russian invasion of Ukraine.