If you are planning to go north and do decide to use malaria medication, consult your doctor before your departure, as you may need to start the treatment two weeks before it becomes fully effective. Normally it is cold in the morning, with clear sunny skies and considerably warmer during the day, with temperature dropping again once the sun sets. Sometimes the rain doesn't make it to Namibia at all. And if it does rain you'll get to see Namibia in a completely different and possibly even more exciting light. Ammo to be replaced at cost.
Clothing Here is a guideline when thinking of what to pack.
Clothing should be of neutral color, green or khaki-tan, light weight but protective. Comfortable footwear is very important. A good hat is essential. Please bear in mind that you will be miles away from any shop or mall and it will not be possible for you to go shopping. Don't forget to bring your own toiletries that you might need.