The study addresses the issue of professional functioning of firefighters in the perspective of onerousness of work and organizational climate. The profession of a firefighter was characterized in the context of applicable regulations and the specificity of difficult and dangerous professions. The concept of organizational climate and its role in determining the quality of work and employee wellbeing are presented. The aim of the research was to assess the organizational climate and take this variable into account in relation to the experience of work hardship. 84 people, aged 24–54, were examined. The empirical material was subjected to statistical analysis using frequency distributions and cross-tabulations. A significant statistical relationship was observed in relation to the category of fatigue, weariness, and overload of the body caused by long-term action. The results indicate that a supportive organizational climate reduces the subjective assessment of this form of onerousness of work. Respondents working in an autocratic climate were more likely to report experiencing this onerousness of work. The obtained results make it possible to formulate practical implications.