Absolute zero is the temperature where the pressure of a gas becomes zero (minimum), so it is the lower limit. As there is no maximum limit of the pressure, there is no upper limit for temperature.

The maximum temperature theorized to have ever existed would be called the Planck temperature, which is 1.4 X 10 to the 32nd power in degrees Kelvin is about 252 with 30 zeros behind it in Farenheit scale. Scientists believe this to be the temperature of the universe at the first few pico seconds of the Big Bang.

To answer this question, I have to talk about temperatures so large that I have to use special notation; so when I write "10^32", I mean ten raised to the 32nd power and so forth. The highest possible temperature, called the Planck temperature, is equal to 1.4 x 10^32 degrees Kelvin. For comparison, the center of the sun is 15 x 10^6 Kelvin. Some scientists believe that our universe has already experienced the Planck temperature, at 1/(10^43) of a second after the Big Bang. The faster particles move, the hotter they get. If there were some electrons traveling near the speed of light, their temperature could theoretically reach 10^32 K. Under these conditions each particle of matter would become a black hole, and space and time would collapse. So the Planck temperature is as hot as things can get in theory. When a quantum theory of gravity is discovered, we may find even higher temperatures are possible. This information is from the following website: http://www.straightdope.com/classics/a3_347.html

That's a physical limit that I do not think exists or can be proven. We might determine a theoretical limit through some pretty sophisticated arithmetic, but proving it would be hazardous to the planet, if not the solar system.

Temperature of what, The Sun Boiling water Body temperature Weather

Theoretically you can just keep going but some say there is a Planck temperature. 1.41679 x 10^32 Kelvins. I think it comes from the idea of using every possible scrap of energy in the universe an pumping it into the smallest possible particle. But is far from conclusive as our understanding of the universe is very incomplete.

The core of the sun is a massive, hydrogen-fusion reaction, like a big H-bomb, with a temperature around 15,600,000 degrees Kelvin. This is calculated based on known measurements of smaller-scale reactions on earth, as well as the knowledge of what goes into the reaction, and what comes out. This is also a bit of an estimate, as we can't be 100% sure of all the variables that might affect the temp. Theoretically, an interaction between large quantities of matter and anti-matter would produce much more energy, mostly in the form of heat. Antimatter reactions have been observed in very small quantities. Using particle accelerators, scientists have been able to create minute quantities of positrons, the antiparticle of the electron, and observed the interaction. As far as measuring either of these temps, we have nothing now that can realistically enter such high temp without being destroyed. As far as an upper limit on temperature, it may not exist. Absolute zero is defined as the point on the temperature scale where all molecular activity stops, it may be that there is no upper limit to temp where it can't go any higher, except perhaps if the kinetic energy of the molecules got so high, that they reached the speed of light.

At 10^-33 s after the big bang, it is estimated that the universe was at a temperature of 10^28 K. Going much closer to the big bang would get you even hotter temperatures, but this is also getting to the limits of our understanding of physics.

There is no agreed-upon value, among physicists, for a maximum possible temperature. Under the current best-guess of a complete theory of physics, the maximum possible temperature is the Planck temperature, or 1.41679 x 10^32 Kelvins. However, it is common knowledge that our current theories of physics are incomplete, thus leaving open the possibility of still higher temperatures.

I dunno. One time it got up to about a 112 degrees, and I didn't think it could get much hotter than that.

the answer is unattainable, whatever is that hot would burn up any thermometer!

If heat is the result of movement and the velocity of light the cosmic speed limit. Maximum heat must arrive when all particles approach it.