September in Yan’an averages a daily high of 23.8°C with nights around 12.3°C. Expect roughly 9.4 wet days totalling 78mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Yan’an is April–May.
Based on YAN AN, CH (0.8km), 1995–2024. 23 years of September data.