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.
Top temperatures of 32C will make things sweaty in Berlin for the Karneval der Kulturen (Carnival of Cultures) this weekend.