Lenexa, located in Johnson County, Kansas, has a humid continental climate with hot summers and cold winters. Summers are typically hot and humid, with average temperatures ranging from the mid-70s to mid-90s Fahrenheit (mid-20s to mid-30s Celsius). Winters are cold, with average temperatures ranging from the mid-20s to mid-40s Fahrenheit (around 0 to 5 degrees Celsius). The city experiences moderate precipitation throughout the year.

Lenexa has a few hydrology constituents, including the Kansas River and Mill Creek, which flow through or near the city. These water bodies provide opportunities for fishing and boating.

For outdoor recreation, Lenexa offers many options. The city has an extensive park system with numerous trails and green spaces for hiking, walking, and biking. Additionally, the Black Hoof Park and Lake Lenexa provide opportunities for fishing, kayaking, and picnicking. Lenexa also hosts several annual outdoor events, such as the Great Lenexa BBQ Battle and the Spinach Festival, which offer a chance to enjoy outdoor activities and experience the local community.