June in Longueuil averages a daily high of 24°C with nights around 14.8°C. Expect roughly 11.6 wet days totalling 100.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Longueuil is May–September.
Based on MCTAVISH, QC CA (9.1km), 1995–2024. 25 years of June data.