September in Shelby averages a daily high of 23.6°C with nights around 12.5°C. Expect roughly 8.9 wet days totalling 69.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Shelby is May–September.
Based on PONTIAC WWTP, MI US (18.5km), 1995–2024. 16 years of September data.