Saint-Bernard is a small village located in Hamilton County, Ohio. It experiences a humid subtropical climate, characterized by hot and humid summers and cold winters. Average temperatures range from the upper 20s to mid-40s Fahrenheit in winter, and mid-60s to mid-80s Fahrenheit in summer. Precipitation is evenly distributed throughout the year, with an average annual rainfall of around 40 inches.

The village is not directly situated near major bodies of water, but it is part of the Ohio River watershed. The local hydrology constituents are primarily composed of streams and creeks that flow into the nearby Mill Creek. The Mill Creek is an important waterway in the region, providing habitat for various aquatic species.

Outdoor recreation opportunities in and around Saint-Bernard are plentiful. Residents and visitors can enjoy activities such as hiking, biking, and picnicking in the nearby parks and nature preserves. Some popular destinations include the Mill Creek Greenway Trail, which offers scenic views of the creek and its surrounding greenery, and Winton Woods Park, which features a lake for boating and fishing, as well as trails for hiking and biking. Overall, Saint-Bernard provides a range of outdoor experiences for nature enthusiasts.