Seymour, Iowa is a small town located in Wayne County, in the southern part of the state. The town experiences a humid continental climate. Summers in Seymour are warm with average temperatures ranging from the mid-70s to mid-80s Fahrenheit, while winters are cold with temperatures often dropping below freezing. The area receives a moderate amount of rainfall throughout the year, with precipitation being fairly evenly distributed.

Seymour is surrounded by several water bodies, including rivers and lakes. The South Chariton River flows near the town, offering opportunities for fishing, canoeing, and kayaking. Outdoor enthusiasts can also explore the nearby Corydon Reservoir and Three Mile Lake, which provide additional fishing and boating opportunities.

The region's hydrology constituents include the Chariton River watershed, which encompasses Seymour. The Chariton River and its tributaries contribute to the hydrological system of the area, supporting the diverse aquatic ecosystem.

In summary, Seymour, Iowa experiences a typical Midwest climate, with warm summers and cold winters. The town benefits from its proximity to water bodies, making it an attractive destination for outdoor activities like fishing, boating, and water sports.