The main purpose of the study was scrutinize the socio- cultural aspects on academic performance in public secondary schools in Tana River County. The study employed the Socio-cultural theory as well as System Theory. The study employed descriptive study design. The study was carried out in public secondary schools in Tana River County with a target population of 253 respondents. A census of sample size of 155 participants. The researcher applied primary data. Questionnaires were applied to gather information from principals whereas interview schedule was applied to gather gen from parents. Expert opinion was used to ensure data validity and reliability. The data was analysed descriptively by means and the standard deviation, while multiple regression analysis was used to establish the influence between the variables. The researcher applied SPSS version 25 to examine facts. Regression, ANOVA, correlation as well as model summary was created in addition, facts were presented in tables. The correlation between the independent variables (home chores activities, community activities, parents’ level of edification besides learners’ engrossment in early marriages) besides the dependent variable (academic performance) outcomes showed that all are positive as well as momentous. Particularly, home chores activities is positively as well as significantly correlated (r=.033, p<.05). Likewise, learner’s involvement in community activities (r=.203, p<.05), parents’ level of education (r=.075, p<.05), and learners involvement in early marriages (r=.230, p<.05) are positively as well as ominously interrelated with academic performance in public secondary schools in Tana River. The constant of fortitude infers that the set of independent variables in this research is in lieu of 51.8% of disparities in the academic recital in public secondary schools. The ANOVA outcomes demonstrate that the F_ ratio is 32.048 with a conforming p-value of .000. The projected model linking the social cultural factors to academic performance in public secondary schools is a decent model. Parents’ participation in edification takes various methods comprising the provision of safe as well as steady environment, scholarly imitations, parent to youngster conversation, good replicas of constructive communal as well as scholastic standards and high ambitions connecting to personal contentment, contact with school to pass gen, contribution in school proceedings as well as school work and governance.