September in Sanmenxia averages a daily high of 26.8°C with nights around 16.7°C. Expect roughly 9 wet days totalling 94.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Sanmenxia is March–May.
Based on YUNCHENG, CH (32.6km), 1995–2024. 23 years of September data.