ABSTRACT Background The teaching staff learns as a result of their daily teaching practice, and yet there is limited knowledge regarding the impact of extracurricular activities within the school, such as science clubs, on the professional growth of science teachers. Purpose This study is proposed to deepen the understanding of how teachers perceive science clubs, what learning they obtain from them, and what factors contribute to promoting this learning. Sample Five experienced science teachers involved in coordinating school science clubs participated in the study. They were all experienced science teachers with some experience in running a science club. Design and methods The study may most accurately be described as a descriptive-qualitative study with a comprehensive scope. Data was obtained through semi-structured interviews. The collected information was analysed from a descriptive and interpretative perspective using techniques specific to content analysis. Results The results show that teachers value science clubs as an opportunity to enhance both their content knowledge and pedagogical knowledge, a space to reconsider what it means to be a science teacher, to get to know and connect more with their students, and to collaborate with other colleagues. Conclusion It is concluded that the study provides evidence that the learning acquired in science club activities complements and expands the interviewed teachers' expertise and contributes to their professional development in all three dimensions: personal, social, and professional.