March in Newmarket averages a daily high of 4.9°C with nights around -6.1°C. Expect roughly 8.4 wet days totalling 41.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Newmarket is May–September.
Based on BALDWIN, ON CA (26.9km), 1995–2024. 20 years of March data.