Niles, Ohio is located in Trumbull County and experiences a humid continental climate. Summers are warm with average temperatures ranging from the mid-70s to the mid-80s Fahrenheit. Winters are cold, with average temperatures ranging from the mid-20s to the mid-30s Fahrenheit. Precipitation is fairly evenly distributed throughout the year, with an annual average of around 40 inches.

The Mahoning River flows through Niles, providing hydrology constituents to the area. Outdoor enthusiasts can take advantage of the river for activities such as fishing, boating, and kayaking. Additionally, Niles offers several parks and green spaces, including Waddell Park and Stevens Park, ideal for hiking, picnicking, and other outdoor recreation opportunities.