June in Belleville averages a daily high of 24.5°C with nights around 14.6°C. Expect roughly 11.1 wet days totalling 89.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Belleville is May–September.
Based on BELLEVILLE, ON CA (2.3km), 1995–2024. 27 years of June data.