"i just ordered some things online and i just realized its going to be quite a hot week here in melbourne wil the transit in the heat compromise my tea?"
I do not believe the transit heat will have much significant impact on your teas. When we talk about optimal conditions/temperature for storage, we talk about intermedium term storage. For example, we import teas immediately after the spring harvest (in China) and store the products for up to 12 months until the next harvest. We store all green teas and certain temperature sensitative Oolong teas under refrigeration and all others under cool and dry conditions to preserve their quality. The shipping time to Melbourne is 2-3 working days which is not longer than the interstate shipping time within China. To a large extend, this is inevitable, unless the tea is consumed locally immediately after the harvest.