Modesto, Illinois is a small village located in Macoupin County. The climate in Modesto is generally characterized as humid continental, with hot summers and cold winters. Summers are warm and humid, with average temperatures ranging from the mid-70s to mid-80s Fahrenheit. Winters are cold, with average temperatures in the 20s and occasional snowfall.

Hydrology constituents in Modesto are primarily influenced by the Macoupin Creek, which runs through the area. This waterway provides opportunities for fishing and boating, attracting outdoor enthusiasts. Additionally, Modesto is surrounded by picturesque rural landscapes, offering scenic hiking trails and nature walks.

Outdoor recreation opportunities in Modesto include camping, picnicking, and wildlife viewing in the nearby parks. Beaver Dam State Park, located just a short drive away, provides a range of activities such as fishing, hunting, hiking, and bird watching. With its serene natural surroundings and proximity to outdoor amenities, Modesto offers residents and visitors ample opportunities to enjoy the beauty of the region and engage in various outdoor activities.