According to this information, you can consider taking some light summer clothes, such as short-sleeved shirts, T-shirts, shorts, skirts and so on. In addition, a thin coat or long-sleeved shirt should be prepared to cope with slightly cooler temperatures or rainy days.
At the same time, don't forget to bring an umbrella or raincoat in case it rains. In addition, remember to bring a pair of comfortable shoes so that you can walk comfortably in Ji 'an.
In short, according to the historical weather situation in Ji 'an, it is suggested that you take summer clothes and prepare some clothes to deal with the unstable weather during May Day.