In my country when I received the chocolates, the temperature was - Max- 37°C & Min- 20°C , so if it survived the 37°C heat of India then it will most probably survive the heat in your country too. The chocolates I got at 37°C were absolutely perfect. So I guess they will be able to bear a lil more temperature too.
And even if they melt you can refrigerate them and they will be fine in 15 mins(it will just not remain in its perfect shape).