Remsen, Iowa is a small town located in the northwestern part of the state. The region experiences a humid continental climate, characterized by hot summers and cold winters. Average temperatures range from the mid-80s°F (30°C) in summer to the low 20s°F (-6°C) in winter, with occasional extremes. Precipitation is evenly distributed throughout the year, with an annual average of around 30 inches (76 cm). Remsen also receives approximately 28 inches (71 cm) of snowfall annually.

Hydrologically, Remsen is situated within the Little Sioux River Watershed. The town is surrounded by agricultural fields and prairies, which can potentially impact local water quality due to runoff from fertilizers and pesticides. Water quality monitoring and conservation efforts are in place to address these concerns.

Outdoor recreation opportunities in Remsen are abundant. The area features several parks and nature reserves, offering opportunities for hiking, bird-watching, and picnicking. The Little Sioux River, which runs near Remsen, provides fishing and kayaking opportunities. Additionally, Remsen is home to a golf course, allowing residents and visitors to enjoy a round of golf in a scenic setting.