Herndon, Virginia, located in Fairfax County, experiences a humid subtropical climate with hot summers and cool winters. The area receives an average of 44 inches of rainfall annually, with the majority occurring in the summer months. The Potomac River and its tributaries, including Sugarland Run and Difficult Run, flow through the area, contributing to the hydrology constituents.

Outdoor recreation opportunities in Herndon include the W&OD Trail, a 45-mile multi-use trail ideal for biking, walking, and running. The Herndon Centennial Golf Course provides a challenging 18-hole course with picturesque views. Lake Fairfax Park offers a range of activities, including camping, picnicking, hiking, and swimming. Additionally, the Herndon Farmers Market, held on Saturdays from April to November, provides a diverse selection of locally grown produce and artisanal products.