September in Ji’an averages a daily high of 31°C with nights around 22.3°C. Expect roughly 7.4 wet days totalling 80mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ji’an is October–November.
Based on JIAN, CH (1.2km), 1995–2024. 23 years of September data.