Jarrell, Texas is a small rural community located in Williamson County. The town experiences a humid subtropical climate, characterized by hot, humid summers and mild winters. Summers are typically long and sunny, with average temperatures ranging from the mid-90s°F (35°C), while winters are relatively mild with average temperatures in the mid-40s°F (7°C).

Hydrologically, Jarrell is situated near the headwaters of the San Gabriel River, which flows through the region. The river provides a source of water and supports a diverse ecosystem. Additionally, there are a few smaller creeks and ponds in the area, contributing to the hydrology of the region.

Outdoor enthusiasts in Jarrell can enjoy various recreational opportunities. The nearby Lake Georgetown provides opportunities for boating, fishing, and swimming. The lake is also surrounded by several parks and trails, which are ideal for hiking, camping, and picnicking. Residents and visitors can explore the scenic trails, observe wildlife, and engage in water-based activities. Additionally, Jarrell is surrounded by vast open spaces and farmlands, offering opportunities for birdwatching, cycling, and horseback riding. With its pleasant climate and natural surroundings, Jarrell offers a range of outdoor activities for individuals and families to enjoy.