September in Rock Hill averages a daily high of 28.9°C with nights around 17.4°C. Expect roughly 6.6 wet days totalling 95.4mm. 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. 28 years of September data.