Oak Creek, Wisconsin is located in the southeastern part of the state, near Lake Michigan. The city experiences a continental climate with hot summers and cold winters. Average temperatures range from 20°F (-6°C) in winter to 80°F (27°C) in summer. Precipitation is evenly distributed throughout the year, with an annual average of 32 inches (81cm).

Oak Creek is bordered by the Oak Creek and Root Rivers, which provide opportunities for outdoor recreation such as fishing, boating, and kayaking. The rivers also contribute to the hydrology of the area, supporting a diverse range of aquatic life. The city is home to several parks, offering amenities like hiking trails, picnic areas, and playgrounds. Oak Creek's proximity to Lake Michigan also allows residents and visitors to enjoy activities such as swimming, beachcombing, and bird watching.