July in Rapid City averages a daily high of 29.9°C with nights around 16.9°C. Expect roughly 10.9 wet days totalling 63.1mm. Generally workable, with some weather to plan around.
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 July data.