Situated in northeastern Kansas, Olathe experiences a typical Midwestern climate characterized by hot summers and cold winters. Summers are warm with temperatures ranging from the 80s to the 90s Fahrenheit, while winters can be chilly with average temperatures in the 30s and occasional snowfall. The region's hydrology constituents include the Kansas River and numerous small creeks that flow through Olathe.

Outdoor enthusiasts in Olathe can indulge in various recreational activities. The city boasts an extensive park system offering opportunities for hiking, biking, picnicking, and sports. Popular outdoor destinations include the Ernie Miller Nature Center, where visitors can explore nature trails and observe wildlife, and Lake Olathe, which provides boating, fishing, and swimming opportunities. Additionally, the city's proximity to the Kansas countryside allows residents to enjoy activities such as camping, hunting, and exploring nature preserves.