We present a survey on subjective heat stress experienced by 323 residents of Karlsruhe, Germany, during heat waves in summer 2013. The results show that subjective heat stress permeates daily life, and measures to cope with heat are performed within the scope of action in daily life. Various individual, social, and environmental factors influence the individual heat stress level. For societal adaptation, further research is necessary on how daily life enables or limits coping with heat.