March in Markham averages a daily high of 5.5°C with nights around -3.9°C. Expect roughly 10.4 wet days totalling 55.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Markham is May–September.
Based on TORONTO NORTH YORK, ON CA (18.6km), 1995–2024. 29 years of March data.