Mount Sidney is a small unincorporated community located in Augusta County, Virginia. Situated in the Shenandoah Valley, Mount Sidney experiences a humid subtropical climate with hot summers and mild winters. Summers are characterized by temperatures ranging from the mid-80s to low 90s Fahrenheit, while winter temperatures typically range from the mid-30s to low 40s Fahrenheit. The area receives an average annual precipitation of around 40 inches, with rainfall distributed fairly evenly throughout the year.

As for hydrology constituents, Mount Sidney is not located near any major rivers or bodies of water. However, it is surrounded by numerous streams and springs that contribute to the local hydrological system.

Despite its small size, Mount Sidney offers various outdoor recreation opportunities. The nearby George Washington National Forest provides opportunities for hiking, camping, and wildlife viewing. The Shenandoah National Park, with its breathtaking landscapes and scenic Skyline Drive, is also within a short driving distance. Additionally, the area is known for its excellent fishing spots, particularly in the nearby South River, which is home to a diverse range of fish species.