September in Hamilton averages a daily high of 26.9°C with nights around 12.5°C. Expect roughly 10.9 wet days totalling 84.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hamilton is September–October.
Based on HAMILTON BUTLER CO REGIONAL AIRPORT, OH US (5.5km), 1995–2024. 26 years of September data.