September in Xining averages a daily high of 19.8°C with nights around 7.3°C. Expect roughly 13.3 wet days totalling 76.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Xining is April–September.
Based on XINING, CH (1.3km), 1995–2024. 23 years of September data.