That is fine, as long as you don't' go over thermal limit the card will work. More important, what is it under load?
We get about 10 posts a week on cpu/gpu temps and 9.9 times out of 10 their normal, under thermal limit. People think their PC should run at 10C under load it seems like, and that is not how electronics work. Power from the wall is turned into heat when the computer runs.
To be honest its not summer yet and 28-30C is kind of on the high side.
If you just love to see lower temps I would try:
Turn down AC to 20C.
Run GPU fan at 100% via afterburner
Run CPU fans at 100%.
As long as your under thermal limits your fine.
Happy computing.