Located in St. Mary Parish, Berwick, Louisiana has a humid subtropical climate with hot summers and mild winters. The town is situated along the Atchafalaya River basin, which is known for its diverse hydrology constituents such as swamps, marshes, and bayous. Outdoor recreation opportunities in Berwick include fishing, boating, and kayaking in the Atchafalaya River and surrounding waterways. The area also offers opportunities for hunting, hiking, and camping in nearby wildlife management areas. Additionally, Berwick hosts an annual Louisiana Shrimp and Petroleum Festival, which celebrates the town's seafood and oil industry.