Typically, the South Dakota city experiences a transition from summer to autumn during this month. Average high temperatures gradually decrease from the low 70s Fahrenheit (low 20s Celsius) at the start of September to the low 60s Fahrenheit (mid-teens Celsius) by the end of the month. Overnight lows follow a similar trend, dropping from the mid-40s Fahrenheit (around 7 degrees Celsius) to the mid-30s Fahrenheit (around 2 degrees Celsius). This period also sees a decrease in average rainfall compared to the summer months.
Understanding the typical climate conditions for this period is crucial for anyone planning to visit or reside in the area. This information can inform decisions related to packing appropriate clothing, scheduling outdoor activities, and preparing for potential weather fluctuations. Historically, September has seen varied weather patterns in this region, from warm, sunny days to early snowfalls, highlighting the importance of preparedness and awareness of potential weather extremes. Accurate weather forecasting plays a vital role in mitigating the impact of these variations on residents and visitors alike.