Mine is getting normally something around ~60 degrees Celsius (CPU temperature) when using it normally, but when the system boots it reaches even 71, so don't worry, it won't burn or explode hehe. And as it was already mentioned it has an overheat protection
---------- Post added at 07:55 PM ---------- Previous post was at 07:38 PM ----------
Originally Posted by XDA-RK
Then I must say your unit got a real cool mind :P, well your unit produce reasonable heat which is very good. But for S4 Pro CPU, 55-56 degree is not the temperature to worry about. Even my Optimus G also heats same as my Xperia Z and both phone uses exactly same hardware. So far I know, above 75 degree is a red alert for this types of CPU though they will shut down before reaching that temperature. Still I am jealous of your phone :P because if your one stays cool that mean you have a better battery backup.
We can always put it in some cold water, to avoid overheating