September in Dearborn averages a daily high of 24.8°C with nights around 13.5°C. Expect roughly 8.8 wet days totalling 80.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dearborn is May–June.
Based on DEARBORN NUMBER 2, MI US (2.7km), 1995–2024. 16 years of September data.