AbstractIntroductionAs early school leaving and dropping out from education pose a challenge for later life adjustment, it is important to identify antecedent factors for the risk of school dropout to tailor individual support for adolescents. Consequently, this study examines the role of adolescents' motivational beliefs and behaviors (i.e., success expectations, planning, and task‐avoidance) as well as their temperament (i.e., extraversion/surgency, negative affectivity, effortful control, and affiliativeness) in their dropout intentions in the first year of upper secondary education.MethodsParticipants were Finnish adolescents' (n = 536; 57% girls, mean age 12.39 at outset, standard deviation = 0.35) and their motivational beliefs and behaviors were measured in Grades 6 and 9. Their temperament was also measured in Grade 9. As for dropout intentions, they were measured in upper secondary education. The effects of gender, academic achievement, task value, and educational track were controlled for in the analyses.ResultsThe results of latent growth modeling showed that, of motivational beliefs and behaviors, high success expectations and low task avoidance independently predicted lower dropout intentions. Success expectations in Grade 6 also mediated the effects of extraversion/surgency, negative affectivity and effortful control on subsequent school dropout intentions, whereas an increase in task avoidance in lower secondary school was a mediator between extraversion/surgency and dropout intentions.ConclusionsOur study provides novel understanding about how temperament is linked with motivational beliefs and behaviors and what roles they together play in subsequent school dropout intentions. Supporting students with different temperaments and achievement motivations would be important to prevent adverse consequences for both the individual and society.