September in Nanjing averages a daily high of 27.9°C with nights around 20.4°C. Expect roughly 6.6 wet days totalling 71mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Nanjing is April–May.
Based on NANJING, CH (18.4km), 1995–2024. 18 years of September data.