What temperature range is there in late August? Also what clothes are good to pack?
Use the "onion"strategy: many easy to pack, wear and undress, light layers. Gloves are not needed. No heavy rain coat needed, but a windproof jacket for the fresh morning and evening breezes and for the sundowner.
30 degrees during the day, but you'll need a good jumper in the evening. in the lodge, you'll be probably dining outside, so a few layers is necessary
Get an answer from Sossusvlei Lodge staff and past guests.