Will it be cold to go to Kunming in late October?

If you just come to Kunming, you can add a coat on the basis of your usual stay. If you stay for a long time, you can also choose to bring a sweater. If you stay for a short time, it will still be cold in winter, so there is no need to bring more. However, if you are weak in keeping out the cold, you should bring more. If you don't have a party in Lengye during the day to cool down, the temperature difference in Kunming is still very large during this time.