Firefighters were called out more than 1,000 times to help deal with the aftermath of extreme weather events during the night.
Various parts of the country were battered by hailstorms and fierce winds that ripped roofs off buildings.
In the village of Aleksandrów in the south-central Świętokrzyskie region, a 76-year-old woman died after being struck by lightning, a police spokeswoman said.
Radio Poland's Marcin Matuszewski has this report.
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