Small scale enterprises (SSEs) are acknowledged in Kenya as significant contributors to economic growth. Despite this, it is estimated that up to 40% of the start-ups fail by year 2 and at least 60% close their doors by year 4. Working capital management is credited as one of the causes of these failures. The purpose of this study was to assess the effect of working capital management practices on the financial performance of SSEs in Kisii South District. The study adopted a cross-sectional survey research design which allowed the collection of primary quantitative data through structured questionnaires. The target population was 159 managers of 101 trading and 58 manufacturing SSEs. Stratified random sampling technique was used to obtain a sample of 113 SSEs comprising 72 trading and 41 manufacturing enterprises. The data was analyzed using both descriptive and inferential statistics. Consequently, the findings of the study were that, working capital management practices were low amongst SSEs as majority had not adopted formal working capital management routines and their financial performance was on a low average. The study also revealed that SSE financial performance was positively related to efficiency of cash management (ECM), efficiency of receivables management (ERM) and efficiency of inventory management (EIM) at 0.01 significance level. The coefficient of determination (R2) indicated that 63.4% of the variations in financial performance (FP) could be explained by changes in ECM, ERM and EIM. The study concluded that working capital management practices have influence on the financial performance of SSEs, hence there was need for SSE managers to embrace efficient working capital management practices as a strategy to improve their financial performance and survive in the uncertain business environment. The study corroborates other research findings that established a positive relationship between working capital management practices and financial performance.