May in Rock Hill averages a daily high of 27.5°C with nights around 15°C. Expect roughly 8.3 wet days totalling 88.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Rock Hill is April–May.
Based on WINTHROP UNIVERSITY, SC US (1.8km), 1995–2024. 26 years of May data.