March in Rockville averages a daily high of 13.7°C with nights around 1.4°C. Expect roughly 10.5 wet days totalling 95.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rockville is April–May.
Based on DALECARLIA RESERVOIR, MD US (16.5km), 1995–2024. 28 years of March data.