Yep, the answer is a bolt of lightning, which can reach temperatures of roughly 30,000 kelvins (53,540 degrees Fahrenheit). The sun, on the other hand, is eclipsed in this case - its surface temperature is just 6,000 kelvins (10,340 degrees Fahrenheit).
Though it is said that Balerion's fire was so intense it burned black, really the hottest of flames is white. Assuming his flame was in fact white hot, as all available art seems to indicate, it burns with a minimum temperature of around 2800 degrees Fahrenheit.
@SW-User You're comment was funny, I literally laughed out loud. I thought I'd add to it. I don't know if how hot you may be;and usually deter myself from such content, (I'm separated but still married) but you definitely are pretty if your profile pic is you.
On a typical day, the white dwarf, at the heart of the Red Spider Nebula (NGC 6537) is around 300,000 Kelvin or 539,540 Fahrenheit. That's about 50 times hotter than our sun:
Quasar 3C-273 is even hotter. New observations show temperatures in the jet of this quasar to reach 10 trillion Kelvin or 18 trillion Fahrenheit:
If you just happened to visit the CERN particle accelerator, in July of 2012, you would have been present to see, briefly, the production of a quark-gluon plasma explosion, that had a temperature of about 5.5 trillion Kelvin or 9.9 trillion Fahrenheit:
Lastly; if you could had been present, during the Big Bang, you would have observed the Planck temperature of 1.416E32 Kelvin.
That's roughly 100 million million million million million degrees!
