August in Newmarket averages a daily high of 26°C with nights around 13.2°C. Expect roughly 10.1 wet days totalling 77.3mm. 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. 17 years of August data.