July in Belleville averages a daily high of 27.2°C with nights around 17.2°C. Expect roughly 10.7 wet days totalling 81mm. 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. 26 years of July data.