I am planning to visit Guilin & Nanning ,what would be the weather and scenery like in early nov.?

Even in the early Nov. the average temperature of Guilin is about 22-24 C. The highest temperature could reach 28-29 C. Actually, the best time for Guilin traveling is from Apr. to Oct. But in the early Nov. you can still view a beautiful scenery there, especially the natural beauty along the Guilin - Yangshuo tour.
Weather at that time for Nanning is similar to that of Guilin. Sometimes, it may be hotter than Guilin because even in Nov. the temperature could reach 30 C. Scenery then is still worth a visit.
Therefore, you need prepare the short-sleeved shirt as well as the long-sleeved shirt.