Due to negative effects of petroleum-based plastic waste on environment, a significant consideration is given to biopolymers as sustainable alternatives. However, incompetence in technology and cost prevent the applications of biopolymers. This study evaluated the effect of compatibilizer and wood fiber filler on five types of biopolymers. To assess weathering characteristics, biocomposites were subjected to 2000 h of accelerated weathering. Biocomposites were soil buried at temperatures of 30°C and 60°C for quantifying biodegradation. Compatibilization improved thermal and physico-mechanical properties. All properties deteriorated upon weathering, but no considerable differences were observed between compatibilized and uncompatibilized composites. After soil biodegradation, weight loss and increased water absorption were observed. Biodegradation was significant after soil burial at 60°C. Compatibilized composites after 30°C soil burial showed lower biodegradation than uncompatibilized composites, but at 60°C, it was reversed. Results confirm improved properties with compatibilization without affecting UV weathering characteristics, and achieving higher biodegradation at elevated temperatures.