Delphos, Ohio experiences a humid continental climate with four distinct seasons. Summers are warm and humid with temperatures averaging around 80 degrees Fahrenheit. Winters are cold with temperatures dropping below freezing, and snowfall is common.

The city of Delphos is situated near the Auglaize River, which is a tributary of the Maumee River. The river provides opportunities for fishing, canoeing, and kayaking.

Delphos also has several parks and recreational areas, including Stadium Park and Veterans Memorial Park, which offer trails for hiking and biking, playgrounds, and picnic areas. Additionally, the city is home to the Delphos Country Club, where residents can golf, swim, and dine.