May in Ellicott City averages a daily high of 23.9°C with nights around 12.1°C. Expect roughly 12.3 wet days totalling 99.2mm. Comfortable conditions for being outdoors all day.
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 May data.