The study investigated the extensiveness of teachers’ workload in determining the acquisition of Kiswahili reading skills among public primary school pupils in Tanga City Council, Tanzania. The study employed a convergent design under mixed methods research approach to collect both quantitative and qualitative data simultaneously and compare the results to obtain a more complete understanding of the research problem. The study targeted 80 public primary schools, 80 head teachers, 264 Kiswahili subject teachers, 24 Ward Education Officer and 1 City Council Primary Education Officer. Both probability and non-probability sampling techniques were employed to obtain respondents who participated in this study. The study involved 8 public primary schools, 8 head teachers, 88 Kiswahili reading skills teachers, 8 WEO and 1 CCPEO. Data were collected using questionnaires, and interview guide. Data collection instruments were validated by Mwenge Catholic University research experts. A pilot study was conducted in two public secondary schools. The reliability of questionnaires for Likert scale items was determined using Cronbach's Alpha Coefficient where reliability coefficient r= 0.892 for Kiswahili subject teachers questionnaire was obtained. The reliability for qualitative data was established through peer debriefing and triangulation. The study adhered to research ethical principles throughout the research process. Quantitative data were analyzed using descriptive statistics particularly using frequencies, percentages and mean with the aid of SPSS Version 22. The study concludes that due to their overwhelming responsibilities, teachers find it challenging to give students timely and insightful feedback on their reading progress. Teachers find it challenging to plan and implement enjoyable reading activities that would greatly enhance their pupils Kiswahili reading skills. Teachers are unable to give each pupils the individualized support and attention they need to improve their reading skills in Kiswahili, leaving them with little time and energy. The study recommends that heads of public primary schools can support teachers in working less by making sure that teachers have enough time to plan, organize, assign reading tasks, and help pupils who are failing with learning. The administration of public primary school should make sure that the school has enough teaching and learning resources for Kiswahili reading instruction.