Shannon City is a small town located in Union County, Iowa, in the United States. The town experiences a humid continental climate, characterized by warm summers and cold winters. The average high temperature in summer is around 85°F (29°C), while the winter temperatures can drop to an average low of 14°F (-10°C). Precipitation is relatively evenly distributed throughout the year.

The hydrology constituents in Shannon City are primarily influenced by the East Nodaway River, which flows through the town. This river provides ample opportunities for fishing and boating. The surrounding area also features several small ponds and lakes, increasing the possibilities for water-based activities.

Outdoor recreation in Shannon City and its vicinity is abundant. The town is surrounded by picturesque natural landscapes, offering opportunities for hiking, camping, and wildlife observation. The nearby Nine Eagles State Park, located just 15 minutes away, provides additional outdoor recreational opportunities, including boating, fishing, hiking, and camping. Overall, Shannon City and its surrounding area offer a variety of outdoor activities that cater to nature enthusiasts and those seeking recreational experiences in a peaceful and natural setting.