September typically marks the transition from summer to fall in the Black Hills region of South Dakota, where Mount Rushmore National Memorial is located. Visitors can expect average high temperatures ranging from the mid-60s to low 70s Fahrenheit (around 18-23 degrees Celsius), while average lows can dip into the 40s Fahrenheit (4-9 degrees Celsius). This period experiences generally dry conditions, though occasional rainfall or light snow flurries are possible. The lessening summer crowds and comfortable temperatures make for pleasant touring conditions.
Understanding the typical climate conditions during this time of year allows visitors to pack appropriately and plan their itineraries effectively. Layering clothing is recommended to accommodate fluctuating temperatures throughout the day. The crisp, clear air of early autumn often provides stunning views of the monument and surrounding landscapes. Historically, September has offered a less congested experience compared to the peak summer months, allowing for a more relaxed visit. This period also coincides with the changing foliage, adding a vibrant dimension to the natural beauty of the area.
