What to pack for a trip to Sth Africa?

I am travelling to Sth Africa in August to visit the safari parks etc on a tour. Im so lost what to pack, does it get really cold at night and hot in the day???
Im from Sydney in Oz so any comparisions would be helpful

i think it might be the same but i am not sure. but i would recommend bringing a toothbrush and tooth paste! lol.

Lords Travel and Tours South Africa – Africa Travel Channel