More implications in case you missed them in a wall of text:
October-December looks like the best time to walk or cycle around Nanning in not so waterproof dress and not get drenched in rain nor sweat. Just 5,9 to 8,5 days of rain (all other months have 10+, and all summer months May-august have 16+), and humidity averaging 74-75 % (all other months have at least 78, and most 80-82%). Daily highs declining from the 28,4 of October to 20,2 of December.

You do have these 6...8 rainy days per months, so follow the weather broadcast.

How are the rules of road in Nanning? Are flying pigeons (and fancier cycles) directed to share road with cars or with pedestrians? And do new developments come with passable light traffic roads/sidewalks?