June in Waterloo averages a daily high of 24.3°C with nights around 13.3°C. Expect roughly 10.9 wet days totalling 83mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Waterloo is May–September.
Based on ROSEVILLE, ON CA (13.6km), 1995–2024. 27 years of June data.