August in Ellicott City averages a daily high of 30.2°C with nights around 19.2°C. Expect roughly 10 wet days totalling 110mm. 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 August data.