This study represents a qualitative synthesis of research examining the socio-environmental influences of coaches, parents and peers on athlete motivation, across the athletic career-span. Using a critical-realist perspective, meta-interpretation methodology was deployed to search and analyse the literature. On-going, iterative analysis generated new areas of enquiry and new search terms, until the emerging analysis reached the points of saturation. Inclusion and exclusion criteria were developed during this process to produce a clear statement of applicability for the study. In the final analysis, a developmental structure was specified to describe the athletic career trajectory, together with a horizontal structure capturing seven domains of the motivational atmosphere surrounding athletes (competition, training, evaluation, emotion, authority, social-support, and relatedness), and a vertical structure varying in terms of level-of-abstraction: The global/ broad 'motivational atmosphere' containing contextual 'climates', built from immediate/situational 'motivational conditions'. A model of the overall 'motivational atmosphere' in sport, based on a meteorological analogy, is offered with a view to stimulating critical debate and new research directions that reflect the complexity of interpersonal motivation in sport.Keywords: motivation; climate; coaching; parent influences; peer influences Motivation is an important and recurring theme in sport psychology: any behaviour exhibited (or not) is a result of motivational processes (Deci and Ryan 1985). Motivation is often confused with ideas concerning energisation or arousal, but it is better understood as a function of the goals, or reasons, behind the motivated activity (Roberts 2001). Hence, when studying the social influences on the motivation of athletes, one is examining the reasons behind the motivated actions and the ways in which coaches, parents and peers, for example, can influence these reasons. These three social agents, taken together, are perhaps the most consistent and reliable sources of influence across the athlete's sporting experience. A number of qualitative studies have recently examined these influences (e.g. Vazou et al.