March in Ellicott City averages a daily high of 12.9°C with nights around 1.6°C. Expect roughly 10.4 wet days totalling 91mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ellicott City is April–May.
Based on BALTIMORE WASHINGTON INTERNATIONAL AIRPORT, MD US (14.4km), 1995–2024. 30 years of March data.