South Vienna is a small village located in Clark County, Ohio. The climate in South Vienna is characterized by hot summers and cold winters. Summers are typically warm with average temperatures ranging from 70°F to 85°F, while winters are cold with average temperatures ranging from 20°F to 40°F. The area receives moderate rainfall throughout the year.

Hydrologically, South Vienna is situated near Mad River, a major watercourse in the region. The village is not directly on the river, but it is located in an area with numerous small creeks and streams that contribute to the hydrology of the region.

Outdoor recreation opportunities in South Vienna are abundant. The area is surrounded by beautiful natural landscapes, including parks, forests, and nature preserves. Nearby Buck Creek State Park offers a wide range of recreational activities such as fishing, boating, hiking, and camping. The park also has a beach area for swimming and picnicking. Additionally, the Little Miami Scenic Trail, a popular trail for walking, running, and biking, passes near South Vienna, providing further opportunities for outdoor enthusiasts.