Bluffton, Ohio has a humid continental climate with warm summers and cold winters. The Blanchard River, a tributary of the Auglaize River, flows through the town and has been known to cause flooding during heavy rainfall. The area is also known for its karst topography, which can lead to sinkholes and other geological features. Outdoor recreation opportunities in Bluffton include hiking and biking on the Blanchard River Greenway Trail, fishing at nearby reservoirs and lakes, and golfing at the Bluffton Golf Club. Additionally, the town hosts an annual summer festival featuring live music, food vendors, and a parade.