As part of the cooperation between KIT and Aristotle University of Thessaloniki and with the kind support of the KHYS-Conys program, we are measuring the heat situation in the inner city of Thessaloniki, Greece. Karlsruhe is one of the warmest places in Germany, so summer heat is already a problem, especially in the city center. Recently published model results suggest that by 2050, the climate will shift in such a way that southern Germany could experience Mediterranean conditions. Therefore, we see the insights gained here as a possible outlook for the future Karlsruhe hot summer. The results should also serve to promote public understanding of the expected local effects of climate change.