April in Hamilton averages a daily high of 19.3°C with nights around 5.5°C. Expect roughly 13.2 wet days totalling 111.9mm. Generally workable, with some weather to plan around.
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. 27 years of April data.