Ann Arbor, Michigan, experiences a shift from summer to autumn during September. This period typically sees a decrease in average temperatures, with highs transitioning from the 70s Fahrenheit (low 20s Celsius) at the start of the month to the 60s Fahrenheit (mid-teens Celsius) by the end. Overnight lows follow a similar trend, falling from the 50s Fahrenheit (low teens Celsius) to the 40s Fahrenheit (single-digit Celsius). Rainfall remains relatively consistent with the summer months.
Understanding these climatic trends is crucial for anyone planning to visit or reside in Ann Arbor during this month. Packing layers of clothing is advisable to accommodate fluctuating temperatures throughout the day. September offers a pleasant balance of warm days and cool evenings, creating an ideal environment for outdoor activities like hiking or enjoying the changing foliage in the surrounding areas. Historically, this time marks the return of students to the University of Michigan, significantly influencing the city’s cultural and social atmosphere.