March in Boulder averages a daily high of 13.6°C with nights around -1.6°C. Expect roughly 8.1 wet days totalling 50.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Boulder is September–October.
Based on BOULDER, CO US (2.5km), 1995–2024. 30 years of March data.