Climate observations are of fundamental importance for reconstructing, monitoring, understanding, and adapting to climate change. They are instrumental for assessments and policy implementations. The need for systematic climate observations is increasing with the growing urgency for adaptation and mitigation measures that can require high resolution information. The conference, organised by the Global Climate Observing System (GCOS), will focus on activities and solutions that help to achieve a fully implemented, sustainable, and fit for purpose global observing system for climate.