September in Flint averages a daily high of 23.5°C with nights around 10.7°C. Expect roughly 9.3 wet days totalling 72.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Flint is May–September.
Based on FLINT FCWOS, MI US (7.2km), 1995–2024. 30 years of September data.