March in Rapid City averages a daily high of 8.2°C with nights around -3.7°C. Expect roughly 7.7 wet days totalling 24.5mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Rapid City is September.
Based on RAPID CITY WEATHER FORECAST OFFICE, SD US (1.8km), 1995–2024. 29 years of March data.