September in Sanchuan averages a daily high of 22°C with nights around 12.7°C. Expect roughly 18.7 wet days totalling 155.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sanchuan is March–April.
Based on LIJING, CH (21.1km), 1995–2024. 23 years of September data.