Hales Corners, Wisconsin has a humid continental climate, with warm summers and cold winters. The average annual temperature is around 48°F, with temperatures ranging from the mid-20s to the mid-70s. The area experiences moderate precipitation throughout the year, with rainfall and snowfall distributed fairly evenly.

The main hydrology constituents in Hales Corners include the Root River, which flows through the village, and several small lakes and ponds. The Root River provides opportunities for fishing, kayaking, and canoeing.

Outdoor recreation opportunities in Hales Corners include Whitnall Park, which offers hiking trails, picnic areas, golf courses, and a botanical garden. Additionally, the village has several parks and green spaces, including Hales Corners Park and Lions Park, which offer playgrounds, athletic fields, and walking paths.