The role of weather in outdoor recreation and nature-based tourism constitutes a growing area of research. Yet how and when weather influences the individual outdoor recreation experience continues to warrant investigation. Furthermore, concepts and knowledge about human-weather relationships are scattered across several disciplines. This paper consolidates the literature and relationships into a conceptual model that illustrates the ways in which recreationists engage with weather during the nature-based outdoor recreation experience. At the core of the model, constructed using a multidisciplinary literature review and expert appraisal process, is the person-weather environment fit process. During each phase of the recreation experience, individuals assess and respond to weather conditions considering their recreational goals, chosen activity, comfort, health and safety, and site access. When faced with an incongruent fit, individuals engage in a process of weather constraints negotiation. Intervening factors and negotiation responses are highlighted, as are personal and other environmental factors that may influence perceptions of the thermal context and weather. The resulting conceptual model is intended to be applicable to most individuals, outdoor recreation activities and settings, and regions. The model can be used to situate existing outdoor recreation-weather research, stimulate future research, and inform management. Management implications•The Weather-Outdoor Recreation Process Model (WORP) provides fodder for academic discourse, testable hypotheses, research ideas, and advances our collective understanding of outdoor recreation.•The model provides outdoor recreation researchers and management interested in understanding how weather plays a role or otherwise influences recreationists' experiences and behaviors with a conceptual map of recreationist-weather interactions.•Researchers may choose to use the conceptual model and accompanying literature review as a means for exploring various concepts and relationships.•Recreation managers may consult the model in order to grasp the range of possible weather concerns and identify entry points for interventions to support year-round recreation and positive outcomes for different groups.•The model can be applied in a training or formal education environment as a basis to discuss the complexities of outdoor recreation and associated variables.•Practitioners can use the WORP to identify how improvements in infrastructure and/or information provision may help increase the ability of outdoor recreationists to negotiate weather constraints.