I'm running the Unify 8-port switch (150W) with 3 PoE APs connected to the switch (1x AP-AC-PRO and 2x AC-AP-Lite). The switch reports 67 degrees C at this moment. So in line with the 70 degrees you see reported on the internet.
In my case, no Cloudkey or USG router, just the PC as controller and the provider-supplied modem/router (Fritzbox 7581).