What heat? I don't think we've had more than a couple of days above 25C this summer in Gdansk.
Down here in Puławy, it is hard to think of a couple of days where it has been under 25C for the last couple of months, as today it is 34C.
But looking at the forecast it looks as if there maybe a break next week with lower temperatures.
My wife works for a scientific institute developing agricultural drought maps for Poland, and this year has been especially bad for crops, which in turn could see a rise in prices for products, due to low productivity.
This map below shows the drought for this summer.