Wow this "issue" keeps coming up this week. I've explained it in quite a few threads now...
Having higher temps in the BIOS/UEFI is normal behavior. <----- if I could have this go all the way across the screen and flash and switch colors, I would.
The CPU cannot enter low-power idle mode until the system is completely booted up and in Windows. When in the BIOS, the cores are somewhat loaded, and with the stock cooler the temps will creep up to a certain point and level off. Most people don't stay in the BIOS long enough to notice how high it gets, but 55-70ºC is normal.
With a good aftermarket cooler, the temps will still creep up, just nowhere near as high.
I have noticed the higher-temp BIOS behavior in at least my last four systems: one Sandy Bridge, one Athlon II X4, one original Phenom quad, and one original Phenom triple. It may go back farther than that, but I don't remember off-hand.