June in Newmarket averages a daily high of 24.5°C with nights around 11.7°C. Expect roughly 11.7 wet days totalling 90.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Newmarket is May–September.
Based on BALDWIN, ON CA (26.9km), 1995–2024. 19 years of June data.