That's pretty warm for a 380 at idle. I have a 390 that doesn't even hit that at load.
Is the airflow constricted around the video card (i.e. is it too close to the bottom of the case/power supply and/or is the card overclocked? Otherwise it could be defective fan/slow auto fan speeds (check and adjust manually using Afterburner) or misapplied thermal paste from factory, defective sensor, etc.
You could try undervolting and underclocking the card if everything seems to check out and it's just poor airflow around the case. Or add more system fans if you have the room.