September in Lhasa averages a daily high of 21.2°C with nights around 9.3°C. Expect roughly 13.2 wet days totalling 61.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lhasa is April–May.
Based on LHASA, CH (3.7km), 1995–2024. 23 years of September data.