Nemaha, Iowa is a small rural town located in Sac County. The climate in Nemaha is characterized by hot summers and cold winters, with average temperatures ranging from the low 20s °F (-6 °C) in winter to the high 80s °F (30 °C) in summer. Precipitation is fairly evenly distributed throughout the year, with an average annual rainfall of around 35 inches (89 cm) and occasional snowfall during the winter months.

Hydrologically, Nemaha sits in the Raccoon River Watershed, with the Raccoon River itself located just west of the town. The area is rich in hydrology constituents such as small creeks and wetlands, providing important habitats for various wildlife species.

Outdoor recreation opportunities in Nemaha and its surrounding area are abundant. Hunting enthusiasts can explore the nearby public hunting areas, such as the Sac County Conservation Board areas, for deer, turkey, and other game. Fishing enthusiasts can enjoy the Raccoon River, which offers opportunities for catching catfish, bass, and other species. Additionally, there are several parks and trails in the vicinity for hiking, biking, and picnicking, allowing visitors to fully immerse themselves in the beautiful natural surroundings.