What is the weather like in Yunnan now? Dad is going to travel 18. I don't know what clothes to prepare for him What should I bring when I go there? Is the temperature difference big?

That depends on where you went to Yunnan. If it's Dali, you can wear thicker clothes. It often rains, but it's not very cold. If you go to Kunming, the thickness is generally good, it is a little cold in the morning and evening, and the temperature difference is not big at other times. Of course, there are many places. Look at your father's destination and decide according to the climate. There is still so much sulfur in Yunnan!