Extreme heat – whether in short, intense bouts (heat waves) or lasting for long periods of time – takes a tremendous and sometimes tragic toll on human health, productivity, infrastructure, agriculture, and how societies function and interact. When coupled with other climate extremes these impacts can be even worse. Predicting, preparing for, and mitigating these hazards requires climate services which are developed with specific decision contexts in mind, and in collaboration with those who will use them to make decisions. In this session we invite abstracts to share innovative approaches and experiences for improving and delivering climate services to help decision makers in disciplines as varied as urban planning, emergency management, public health, and utilities to understand, prepare for, and respond to extreme heat risks. Abstracts with a focus on collaborations crossing agencies, disciplines, sectors, and even national boundaries are strongly encouraged.