State weather forecaster DWD said thermometers in southern Germany could reach 34C on Sunday.
On Friday highs of 27C are predicted, followed by 30C on Saturday and the record-breaking temperatures on Sunday and Whit Monday.
DWD is forecasting “widespread” sunshine for Saturday with the highest temperatures in the Rhineland.
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On Sunday temperatures will rise to between 27C to 34C in the south. Closer to the northern coast it will be between 20C and 25C.