September in Hamilton averages a daily high of 16.7°C with nights around 9.7°C. Expect roughly 16 wet days totalling 83.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hamilton is June–September.
Based on AUCHINCRUIVE, UK (46.4km), 1995–2024. 26 years of September data.