As jimthenagual says your processor has a TCase value of 67.4°C; anything from the Tcase and below will be the expected temperature of the processor in normal use. When the processor is stressed out meaning that you are running heavy processor applications that take control of the CPU or uses it at 100% the temperature will go beyond the Tcase. It can reach 80 degrees and the processor will still be OK. The cooling fan is to keep that temperature there.
If the processor temperature reaches 100 degrees or more it will send a signal to the motherboard to shut down to prevent major damage.